英和和英

the leading topics

abstruse subjects

the basic theme (of a story)

turbulent subjects

the main subject of a matter

the core of a thing

a fundamental proposition

the main point of a matter

the sentential subject

something that is fundamental

a written summary of essential points

peripheral issues

digress from the main subject

the point of a subject that is being discussed

a minor subject

a taking topic

a main system

a basis for something

the subject concerned

the principle of the matter

the root of the matter

the essence of the matter

trivial matters

a prerequisite subject

the main course

the main course

an object of study

the ultimate principle

the fundamental part

a fundamental unit