division cycle的用法和樣例：
例句
- Wilmut said there were so many failures because it was difficult to ensure that the empty oocyst and the donor cell were at the same stage of the cell division cycle.
威爾馬特說(shuō)之所以有這么多的試驗失敗，是因為很難保證空卵囊和供體細胞能處在細胞分裂周期的同一階段。 - Approximately four days after fertilization and after several cycles of cell division, these totipotent cells begin to specialize.
在受精后并經(jīng)歷了四天的細胞分裂周期后，這些細胞開(kāi)始具有特殊性。
