1 00:00:00,000 --> 00:00:01,648 在上一个视频中, 2 00:00:01,648 --> 00:00:19,598 我们刚刚开始 3 99:59:59,999 --> 99:59:59,999 了解[细胞的]减数分裂。 4 99:59:59,999 --> 99:59:59,999 并且保证更加精确,