In metaphase 2, the centromeres contain two kinetochores that attach to spindle fibers from the centrosomes at opposite poles.

中期 2，着丝粒与纺锤丝连结。

The spindle fibers shorten and the centromere divides, so each chromosome becomes two separate chromatids.

纺锤丝缩短了，着丝粒分裂，所以每个染色体变成两个独立的染色单体。

The DNA is exactly replicated, and each chromosome now becomes two identical chromatids joined by the centromere.

DNA 被精确地复制了，每条染色体现在变成了两条由着丝粒连接的相同染色单体。

That is taxing because some parts of a chromosome, such as those near the centromere (the place where the two arms of a chromosome meet) are not easy to get at.

这是项艰难的任务，因为有些染色体很难处理，例如那些位于着丝点（一个染色体的两臂交汇之处）附近的染色体。