専門分野の日本語Japanese for Specialized Fields
Chapter Objectives
By the end of this chapter, you will be able to:
- Recognize and use domain-specific collocations across business, science and technology, education, the arts, finance, health communication, and policy-adjacent texts.
- Define and classify specialized concepts in Japanese using layered definitions appropriate to a general educated audience.
- Make cautious, appropriately hedged claims about specialized topics using に基づく and をめぐる.
- Read short specialized passages from several fields, using rare-term furigana strategically rather than relying on it for every unfamiliar word.
- Distinguish core general vocabulary from field-specific terminology, and identify when a term needs to be explained for a non-specialist reader.
- Write a short explanatory paragraph that introduces a specialized topic to a general audience without oversimplifying it inaccurately.
- Discuss a specialized topic in conversation, asking for clarification when unfamiliar terminology appears.
Communication Scenario
Now that the "voices of the neighborhood" issue has gone to print, the magazine's editor has invited Emma to join a small volunteer team preparing a new occasional section called "くらしと専門知識" ("Everyday Life and Specialized Knowledge"), which explains developments from different fields in plain but accurate language for general readers. Her first assignment is to sit in on a short planning meeting where a local clinic nurse, a small business owner, and a university student researcher each pitch a topic — a public-health notice about seasonal allergies, a small business's move to cashless payment, and a linguistics student's explanation of a local language survey — and Emma must take notes, ask clarifying questions about unfamiliar terminology, and draft a short introductory paragraph for one of the three topics.
- The learner listens to three short specialized pitches and identifies the field and central claim of each.
- The learner asks for clarification about unfamiliar domain terminology in a natural, level-appropriate way.
- The learner reads short specialized texts from at least two different fields and identifies definitions, classifications, and cautious claims.
- The learner writes a short explanatory paragraph introducing one specialized topic to a general audience.
- The learner discusses the three pitches with a partner or instructor, deciding which topic best fits the new magazine section.
Core Vocabulary
This chapter's vocabulary spans several specialized domains. Each item is chosen for its usefulness in explaining a specialized topic to a general audience, not for full technical mastery of any one field. New terms here do not require any unscheduled grammar, kanji reading, or counter beyond what this chapter authorizes.
| Japanese | Reading | Meaning | Domain |
|---|---|---|---|
| 分野 | ぶんや | field, area (of study or work) | General/academic |
| 専門用語 | せんもんようご | specialized terminology | General/academic |
| 定義する | ていぎする | to define | General/academic |
| 分類する | ぶんるいする | to classify | General/academic |
| 導入する | どうにゅうする | to introduce (a system, technology) | Business/technology |
| キャッシュレス決済 | キャッシュレスけっさい | cashless payment | Business/finance |
| 花粉症 | かふんしょう | seasonal (pollen) allergy | Health |
| 症状 | しょうじょう | symptom | Health |
| 対策 | たいさく | countermeasure, response strategy | Health/policy |
| 調査 | ちょうさ | survey, investigation | Academic/research |
| 言語使用 | げんごしよう | language use | Academic/linguistics |
| 一般読者 | いっぱんどくしゃ | general reader | Media/publishing |
All twelve items above are productive for this chapter. Additional field-specific vocabulary that appears in the reading passages below is glossed in context and treated as receptive unless it repeats across multiple exercises.
れんしゅう — Practice: Sort the twelve vocabulary items above into the three domains represented in the Communication Scenario (health, business, academic/linguistics), noting that 分野, 専門用語, 定義する, and 分類する apply across all three.
Script and Terminology Focus
This chapter's script focus is specialized kanji and terminology, with furigana reserved for genuinely rare or field-specific readings rather than applied broadly. As a Unit IV chapter following the Chapter 15 assessment, mixed-script reading is expected at a consolidated level; this chapter extends that control into denser, terminology-heavy sentences.
In earlier chapters, furigana often supported entire sentences of unfamiliar kanji. From this chapter forward, furigana in specialized texts is reserved for genuinely rare readings, technical terms outside the active kanji set, and names — for example, 花粉症 may appear with furigana on first mention in a health passage, then without furigana afterward, since it becomes a repeated key term. Kanji you have already consolidated, such as 対策 or 調査, should not carry furigana in this chapter's texts.
When you meet an unfamiliar specialized term without furigana, use context, surrounding definitions, and word structure — not guesswork about pronunciation alone — to understand its meaning.
れんしゅう — Practice: Look at the four new kanji cards above. For each one, write one word you already know that shares a component or a reading pattern, and explain the connection in one sentence.
Pronunciation Focus
Specialized vocabulary is often built from longer Sino-Japanese compounds, such as キャッシュレス決済 or 言語使用. Practice maintaining even mora timing and consistent long-vowel and geminate-consonant accuracy across these longer words, rather than slowing down and losing rhythm mid-word. Continue treating pitch-accent notation as a reference tool rather than a requirement; where this chapter's audio or read-aloud scripts model a term, listen for its natural phrase-level pitch rather than trying to mark accent yourself.
Grammar and Sentence Patterns
This chapter authorizes domain collocations, definitions, classification patterns, cautious claims, and two connective patterns for citing a basis or framing a topic under discussion: に基づく and をめぐる. No new verb morphology or clause type is introduced; these patterns build on the source-attribution and stance systems already active from Chapters 4 and 12.
1. Layered definition: 〜とは〜のことです / 〜という〜です
Purpose: to define a specialized term for a general reader in a compact, natural sentence.
- 花粉症とは、花粉が原因で起こるアレルギー症状のことです。"Kafunshō" refers to allergy symptoms caused by pollen.とは〜のことです — formal definition frame
- キャッシュレス決済というのは、現金を使わずに支払いをする方法です。"Cashless payment" is a method of paying without using cash.というのは〜です — definition frame, review from Ch. 2
2. Classification: 〜は〜に分類される / 〜の一種である
Purpose: to place a specific case within a broader category.
- この調査は、社会言語学の一種に分類される。This survey is classified as a type of sociolinguistics.〜の一種に分類される — classification pattern
3. Citing a basis: 〜に基づく
Purpose: to state that a claim, plan, or policy is grounded in specific data, research, or a specific source.
- この対策は、去年の調査結果に基づいている。This countermeasure is based on last year's survey results.に基づいている — grounded claim
4. Framing a topic under discussion: 〜をめぐる
Purpose: to introduce a noun phrase as the subject of ongoing discussion, debate, or activity, without stating a personal stance.
- キャッシュレス決済の導入をめぐる意見は、店によって様々だ。Opinions surrounding the introduction of cashless payment vary from shop to shop.をめぐる — topic-framing, neutral
When explaining a specialized topic to a general audience, precision about certainty matters as much as precision about content. に基づく signals that a claim rests on a stated source rather than on the writer's own authority, and をめぐる frames a topic as contested or actively discussed rather than settled. Both patterns let a writer explain a specialized field honestly without pretending to more certainty than the source material supports — the same cautious-claim habit introduced with とされる and と考えられる in Chapter 4.
Grammar Practice
- Write a definition of 専門用語 itself, using 〜とは〜のことです.
- Write one sentence classifying a topic of your choice using 〜の一種に分類される.
- Write one sentence using に基づく about a decision, plan, or policy you know of.
- Write one sentence using をめぐる to frame a topic currently being discussed in your own community.
Model Dialogue
Setting: The magazine's planning meeting. A clinic nurse, a small business owner, and a university student researcher each present a short pitch; Emma asks clarifying questions. Polite style throughout, appropriate to a small volunteer planning meeting among people who do not know each other well.
Emma takes notes on each pitch, marking which terms she will need to define for readers unfamiliar with the field.
ないようりかい — Comprehension check: Which speaker uses に基づく, and what claim is it attached to? Which speaker uses をめぐる, and what topic does it frame?
Guided Practice
タスク１ — Term-spotting. Reread the Model Dialogue and list every specialized term that Emma would likely need to define for a general reader, noting which field each belongs to.
タスク２ — Definition drafting. Choose one term from your list in Task 1 and write a one-sentence definition using 〜とは〜のことです or 〜というのは〜です.
タスク３ — Pattern substitution. Rewrite the nurse's first line, the shop owner's second sentence, and the researcher's first sentence, replacing the specific topic in each with a topic of your own choosing while keeping the same grammar pattern.
Listening Practice
Ask your instructor, a partner, or a text-to-speech tool to read the following short passage aloud at a natural, unhurried pace appropriate to a planning meeting.
きくタスク — A fourth pitch
最後に、地域の図書館員が短い提案をした。「最近、子ども向けのプログラミング教室をめぐる問い合わせが増えています。この教室は、コンピューターサイエンスの一種に分類される内容ですが、専門用語をできるだけ使わずに、小学生にも分かるように説明しています。」
聞くタスク — Listening task: Listen at least twice. (1) What field does the librarian's pitch belong to? (2) What noun phrase does をめぐる frame in this passage, and what does that tell you about the topic's current status? (3) According to the librarian, how does the class avoid overwhelming young learners with terminology?
Speaking Practice
コントロールされた練習 — Controlled practice: Pattern drill
- ＿＿＿＿＿とは、＿＿＿＿＿のことです。 (define a term from your own life or field)
- ＿＿＿＿＿は、＿＿＿＿＿の一種に分類される。 (classify something familiar to you)
- ＿＿＿＿＿は、＿＿＿＿＿に基づいている。 (state that something is grounded in evidence or a source)
- ＿＿＿＿＿をめぐる意見は、＿＿＿＿＿。 (describe varied opinions on a topic)
コミュニケーションタスク — Choosing a topic
With a partner or instructor, role-play the planning-meeting discussion after all four pitches (the nurse, the shop owner, the researcher, and the librarian). Decide together which topic best fits the new magazine section, using at least one definition pattern, one classification pattern, and one of に基づく or をめぐる during the discussion.
ひとりでもできる練習 — Solo practice: A specialized topic from your own field
Record a one-to-two-minute spoken explanation, in Japanese, of one specialized topic from your own studies, work, or interests, aimed at a general audience. Include a definition, a classification, and at least one cautious claim.
Reading Practice
Read the two short passages below, each drawn from a different specialized field, and complete the questions that follow.
お知らせ：花粉症対策について
花粉症は、花粉が原因で起こるアレルギー症状の一種で、くしゃみや鼻水、目のかゆみなどが主な症状です。今年の調査に基づくと、例年より早い時期から症状が出ている人が多いとされています。対策としては、外出時にマスクや眼鏡を使うこと、帰宅後すぐに服を着替えることなどが効果的だと考えられています。
コラム：小さな店のキャッシュレス化をめぐって
キャッシュレス決済の導入をめぐる議論は、この数年、小規模な店の間でも続いている。手数料の負担を理由に導入をためらう店主がいる一方で、若い客層を意識して積極的に導入する店も増えている。ある調査に基づくと、キャッシュレス決済を導入した店の多くが、客の滞在時間や購入額に大きな変化はなかったと回答している。
- In the first passage, what two definition or classification patterns are used to introduce 花粉症?
- In the first passage, identify one cautious-claim expression and explain what source it points to.
- In the second passage, what does をめぐって tell you about the current state of the cashless-payment discussion among small shops?
- In the second passage, summarize in English what the survey mentioned with に基づくと actually found.
Writing Workshop
Write a short explanatory paragraph (roughly six to ten sentences, in standard Japanese) introducing one of the three original pitches from the Communication Scenario — the health notice, the cashless-payment story, or the dialect survey — for a general magazine reader who has no background in that field.
- Choose your topic and identify the one or two specialized terms a general reader would not already know.
- Open with a definition of your central term using 〜とは〜のことです or 〜というのは〜です.
- Classify the topic within a broader category using 〜の一種に分類される where natural.
- Support one claim with a stated basis using に基づく.
- Frame the topic's current status using をめぐる if the topic involves ongoing discussion or change.
- Close with one sentence explaining why a general reader might find the topic useful or interesting.
チェックリスト — Editing checklist:
- I have defined my central specialized term clearly for a non-specialist reader.
- I have used at least one classification pattern and one cautious-claim pattern from this chapter.
- I have not overused furigana on kanji I have already consolidated.
- My paragraph does not overstate certainty beyond what my stated basis supports.
- I have checked kanji, particles, and register for accuracy and consistency.
Culture and Communication
Neighborhood and community publications in Japan frequently carry short, accessible explanations of specialized topics — public-health notices, changes to local business practices, or summaries of local research — written by community members rather than professional journalists or subject specialists. Writing well for this kind of audience means balancing accuracy with accessibility: a term cannot be dropped just because it is technical, but it must be defined clearly enough that a reader without background knowledge is not left behind.
The researcher's dialect survey in this chapter's dialogue connects directly to the regional and social variation studied in Chapter 14. Specialized academic writing about dialects still requires the same respectful, non-hierarchical framing practiced earlier in the course; describing a survey's findings accurately is not the same as ranking the varieties it studies.
Common Mistakes to Avoid
Error: Introducing キャッシュレス決済 or 花粉症 without any definition, assuming the reader already knows the term.
Correction: Open with a clear definition before using the term freely: キャッシュレス決済とは、現金を使わずに支払いをする方法のことです。
Error: Adding furigana to familiar words such as 対策 or 調査 out of habit, which clutters a specialized text and signals that the kanji is harder than it is.
Correction: Reserve furigana for genuinely rare or first-mention terms, such as 花粉症 on its first appearance, and remove it afterward.
Error: Writing 今年は症状がひどくなる。 as a flat, certain prediction based on a single survey.
Correction: Attach the claim to its basis and keep the hedge: 今年の調査に基づくと、症状が重くなる人が多いとされている。
Chapter Review
Section A — ごい (Vocabulary)
1. Complete the Core Vocabulary sorting practice above.
Section B — もじ (Script)
1. Complete the Script and Terminology Focus practice above.
Section C — ぶんぽう (Grammar)
1. Complete the Grammar Practice exercises above.
Section D — どっかいりかい (Reading comprehension)
1. Complete the Reading Practice questions above.
Section E — かくこと (Writing)
1. Complete your explanatory paragraph following the Writing Workshop steps, as part of the Practical Performance Task below.
Section F — はなすこと (Speaking)
1. Complete the planning-meeting discussion task from Speaking Practice, as part of the Practical Performance Task below.
Practical Performance Task
パフォーマンスタスク
くらしと専門知識：新しいコラムを企画する — Planning the New Column
Complete all four parts below to demonstrate control of this chapter's specialized-field systems.
- Listening: Complete the Listening Practice task above and identify the librarian's field and central claim.
- Reading: Answer the Reading Practice questions for both specialized passages above.
- Spoken interaction: With a partner or instructor, complete the planning-meeting discussion role-play from Speaking Practice, using at least one definition, one classification, and one cautious-claim pattern.
- Written production: Submit your Writing Workshop paragraph, checked against its editing checklist.
Assessment focus: accurate definition and classification of a specialized term for a general audience; correct and natural use of に基づく and をめぐる; appropriately cautious claims; disciplined furigana use limited to rare or first-mention terms; and accurate kanji, particles, and register throughout spoken and written work.
Answer Key
Core Vocabulary
Health: 花粉症, 症状, 対策 (also general). Business/finance: キャッシュレス決済, 導入する. Academic/linguistics: 調査, 言語使用. General/academic (applies to all three): 分野, 専門用語, 定義する, 分類する, 一般読者.
Script and Terminology Focus
Open-ended; check that learners connect new kanji to previously studied words sharing components or readings (for example, 策 with 政策 if known, or 導 with 指導 if known) and explain the connection accurately.
Grammar Practice
Open-ended; model answers: (1) 専門用語とは、特定の分野で使われる言葉のことです。 (2) これは自然災害の一種に分類される。 (3) この計画は、市の調査結果に基づいている。 (4) この問題をめぐる意見は、世代によって異なる。
Model Dialogue — Comprehension Check
The nurse uses に基づいて, attached to the claim that more people than usual have severe symptoms this year, based on survey results. The shop owner uses をめぐる, framing opinions about the introduction of cashless payment as varying from shop to shop.
Guided Practice
(1) Open-ended; expected terms include 花粉症, 対策, キャッシュレス決済, 導入, 社会言語学, 方言使用, sorted by field. (2)–(3) Open-ended; evaluate against the Grammar section patterns and the Model Dialogue.
Listening Practice — Model answers
(1) The librarian's pitch belongs to education/computer science (a children's programming class). (2) をめぐる frames inquiries about the programming class, indicating that interest in the topic is currently active and increasing. (3) The class avoids overwhelming young learners by explaining the content without unnecessary specialized terminology, in a way elementary-school students can understand.
Reading Practice
(1) 花粉症は、花粉が原因で起こるアレルギー症状の一種で combines a definition with a classification pattern. (2) 今年の調査に基づくと is the cautious-claim expression, pointing to this year's survey as its source. (3) をめぐって indicates that discussion about cashless-payment adoption among small shops is ongoing and unresolved, not settled. (4) The survey found that most shops that adopted cashless payment reported no major change in how long customers stayed or how much they purchased.
Chapter Review — Sections A through D
Open-ended; check against the Core Vocabulary, Script and Terminology Focus, Grammar Practice, and Reading Practice sections above.
Chapter Review — Sections E and F, and Practical Performance Task
These are open-ended production tasks. Evaluate the written paragraph against the Writing Workshop checklist above, and evaluate the spoken interaction and listening summary against the assessment focus listed under the Practical Performance Task.
Looking Ahead
いまできること — What you can do now
You can define and classify specialized terms for a general audience across several fields; make cautious, appropriately hedged claims using に基づく and をめぐる; read short specialized passages while using furigana strategically rather than by default; and write and discuss a short explanatory paragraph that introduces a specialized topic accurately and accessibly. This begins Unit IV of Volume IV. The next chapter turns from explaining existing specialized knowledge to designing and describing original research.