When these early cells divide, each passes on its X inactivation.

当这细胞分裂时，每个细胞都会传递其X染色体失活状态。

The embryo split into twins before X inactivation, so each twin ended up with a different inactivation pattern.

胚胎在X染色体失活前分裂成双胞胎，因此每个双胞胎最终形成了不同的失活模式。

Currently, how people usually look at it, we have to give more surfactant, we have to revert this inactivation, right?

目前， 人普遍认为，我给予更多的表面活性物质， 必须逆转这种失活，对吧？

Women with one mutated gene copy have a remaining healthy copy, so they don't get hemophilia unless X-chromosome inactivation turns off the normal copy in the majority of cells.

携带一个突变基因的女性还有一个健康的基因拷贝，所以她一般不会患血友病，除非X染色体失活多数细胞中正常的基因拷贝沉默。

Now if this inactivation's random, you'd expect about half of the female's cells to have a functional dystrophin gene and the other half to have a defective dystrophin gene, and these people are typically asymptomatic.

如果失活是随机的，可以预料到女性一半的细胞中抗肌萎缩蛋白基因是正常的，另一半是有缺陷的，通常这人无临床症状。

There are still unresolved questions about X inactivation, like how some genes on the X chromosome escape inactivation and why inactivation isn't always random.

关于X染色体失活， 仍存在一未解之谜，例如，某位于X染色体上的基因如何逃脱失活机制， 以及为何失活过程并非总是随机发生。