先决条件

A set of circumstances that makes it possible to do something; a favorable time or occasion.

Crucial, key, or extremely important. It refers to the most significant part of a problem or situation.

Of most importance; principal or main. It identifies the primary part of a set of things, ideas, or reasons.

A condition or situation that puts one in an unfavorable or inferior position; a disadvantage. The direct opposite of 优势.

The act or instance of making or becoming different. Highly important for IELTS Writing Task 1 (describing graphs) and Task 2 (social changes).

Used to single out one person, thing, or situation as being more important or notable than others. It is similar to 'especially' or 'particularly'.

Used to emphasize something surprising or extreme. It marks a higher degree of a quality or situation, often translated as 'even' or 'so much so that'.

Free from outside control; not depending on another's authority. Also describes the ability to think or act for oneself.

To come into possession of; to get or acquire something, often through effort or as a result of a process.

Considered in relation or in proportion to something else. It also means facing each other or opposite.