the subject matter of a conversation or discussion

同义词：topic  /  theme

some situation or event that is thought about

同义词：topic  /  issue  /  matter

a branch of knowledge

同义词：discipline  /  subject area  /  subject field  /  field  /  field of study  /  study  /  bailiwick  /  branch of knowledge

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

同义词：content  /  depicted object

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

同义词：case  /  guinea pig

a person who owes allegiance to that nation

同义词：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

cause to experience or suffer or make liable or vulnerable to

make accountable for

make subservient; force to submit or subdue

同义词：subjugate

refer for judgment or consideration

同义词：submit

not exempt from tax

possibly accepting or permitting

同义词：capable  /  open

being under the power or sovereignty of another or others

同义词：dependent

likely to be affected by something (especially something unpleasant)