- 重点词汇
- 形成
form; take shape; constitute; develop; forge; generate; draw; grow up; channel; germinate; determine; pattern; evolve; come into being; crystallize; emerge; formation; growth; constitution; development; generation; gestation; production; developmental
- 原因
reason; cause; source; rationale; basis; occasion; motive; motivation; sense; meaning; anatomy; recipe; explanation; causation; causal