单词：division cycle
division cycle的用法和样例：
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.威尔马特说之所以有这么多的试验失败，是因为很难保证空卵囊和供体细胞能处在细胞分裂周期的同一阶段。
- Approximately four days after fertilization and after several cycles of cell division, these totipotent cells begin to specialize.在受精后并经历了四天的细胞分裂周期后，这些细胞开始具有特殊性。
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