n.

the subject matter of a conversation or discussion

"he didn't want to discuss that subject"

同義詞：topictheme

some situation or event that is thought about

"he had been thinking about the subject for several years"

同義詞：topicissuematter

a branch of knowledge

"teachers should be well trained in their subject"

同義詞：disciplinesubject areasubject fieldfieldfield of studystudybailiwickbranch of knowledge

something (a person or object or scene) selected by an artist or photographer for graphic representation

"a moving picture of a train is more dramatic than a still picture of the same subject"

同義詞：contentdepicted object

a person who is subjected to experimental or other observational procedures; someone who is an object of investigation

"the subjects for this investigation were selected randomly"

同義詞：caseguinea pig

a person who owes allegiance to that nation

"a monarch has a duty to his subjects"

同義詞：national

(grammar) one of the two main constituents of a sentence; the grammatical constituent about which something is predicated

(logic) the first term of a proposition

Estimating Survivorship when the Subjects are Visited Periodically
Effects of bariatric surgery on mortality in Swedish obese subjects
Mixed-Effects Modeling with Crossed Random Effects for Subjects and Items.
Prevalence of atrial fibrillation in elderly subjects (the Cardiovascular Health Study)
Mechanisms of bronchial hyperreactivity in normal subjects after upper respiratory tract infection.
Implicit and explicit memory for new associations in normal and amnesic subjects.
Mixed-effects modeling with crossed random effects for subjects and items. Journal of Memory and Language, 59, 390-412
CIRCULATING ANGIOTENSIN II LEVELS UNDER REPEATED ADMINISTRATION OF LISINOPRIL IN NORMAL SUBJECTS
The Belmont Report. Ethical principles and guidelines for the protection of human subjects of research.
The Association Between Quantitative Measures of Dementia and of Senile Change in the Cerebral Grey Matter of Elderly Subjects