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。

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.

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胚性细胞分裂产生两个细胞，进而分化发育成多细胞原胚、球形胚、心形胚及子叶胚。

Then embryogenic cell divided into two cells, which sequentially differentiated through multicell proembryo, globular, heart-shaped and cotyledonary embryo stages.

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If X is the number of cells, then the rate of change of X, dX/dt, the rate of change of the cell population, how fast division is taking is proportional to the number of cells I have.

如果X是细胞数目,那么X的改变率就是dX/dt,就是细胞数目的改变率,分裂的速度有多快,和细胞数量呈比例关系

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