- 重点词汇
- 精子
sperm; spermatozoon; spermatozoa; come; spermium
- 生产
production; manufacture; childbirth; parturition; labor; delivery; birthing; confinement; produce; make; give birth; yield; generate; create; bring forth; bring out; turn out; come out with; productive; on stream
- 周期
cycle; period; circle; periodicity; periodic; cyclic