subfield
/ˈsəb-ˌfēld/ (ame, mw)
subfield — 名詞
1. a particular area of study or research that forms a smaller, more focused part o
分支領域
大型學科中的專業分科
a particular area of study or research that forms a smaller, more focused part of a larger academic discipline — for example, bioinformatics is a subfield of biology, and behavioural economics is a subfield of economics.
Omar decided to specialise in astrophysics, a subfield of physics that studies stars and galaxies.
Omar 決定專攻天體物理學，這是物理學中研究恆星與星系的一個分支領域。
subfield + of + [broader field] for specialisation
Computational linguistics is a growing subfield that sits between computer science and language studies.
計算語言學是一個快速發展的分支領域，介於電腦科學與語言研究之間。
subfield described with 'growing' + preposition 'between'
The university is hiring three new professors for the subfield of environmental economics.
這所大學正在為環境經濟學這個分支領域招聘三位新教授。
Each subfield of psychology, from child development to social behaviour, has its own research methods.
心理學的每個分支領域——從兒童發展到社會行為——都有各自的研究方法。
Several journals now focus exclusively on the subfield of marine conservation biology.
有數本期刊現在只專注於海洋保育生物學這個分支領域。
- specialty
more common in US English; often used for medical or professional fields rather than academic branches
- branch
broader and less formal; can refer to any division of knowledge or an organisation
- discipline
larger in scope than a subfield; a subfield belongs to a discipline
- field
the broader area that contains the subfield
文法句型
subfield + of + [broader field]
用法筆記
Often paired with 'within' or 'of' to name the larger discipline. The word implies a recognised, organised branch of study rather than a temporary research interest.
常見錯誤
2. a number system contained inside a larger number system (such as the rational nu
子體
自身構成體系的數學子集
a number system contained inside a larger number system (such as the rational numbers inside the real numbers) and using the same addition and multiplication rules, while still obeying all the algebraic laws that define a field.
Professor Chen asked her algebra class to verify that the rational numbers are a subfield of the real numbers.
Professor Chen 請她的代數課學生驗證有理數是否為實數的一個子體。
subfield + of + [set] + 'verify that' with that-clause
In algebra class, Yuki proved that the Gaussian integers are not a subfield of the complex numbers.
在代數課上，Yuki 證明了高斯整數並非複數的子體。
On the final exam, Aiko correctly stated that every field contains at least two subfields — itself and its prime subfield.
期末考時，Aiko 正確指出每一個體至少包含兩個子體——自身與它的質子體。
Piotr's thesis examined whether the set of constructible numbers forms a subfield of the real numbers under the usual operations.
Piotr 的論文探討了可構作數集在一般運算下是否構成實數的一個子體。
During office hours, Leila sketched a diagram to show how the complex numbers contain the real numbers as a subfield.
在諮詢時間，Leila 畫了一張示意圖說明複數如何包含實數作為一個子體——這就是體擴展的概念。
文法句型
subfield + of + [mathematical field]
用法筆記
A strictly technical term in abstract algebra. The subfield must be closed under the same field operations as the larger field — it is not just any subset. Distinguish from a 'subring', which does not require multiplicative inverses.