- 重点词汇
- 儿童
children; child; youngster; kid
- 发育
grow; develop; mature; evolve; flourish; growth; development; maturation; developed; grown; developing; developmental
- 倒退的
retrogressive; retrograde; retral; reversional
- 原因
reason; cause; source; rationale; basis; occasion; motive; motivation; sense; meaning; anatomy; recipe; explanation; causation; causal