英语语法分析

Each chromosome in pachytene actually have been composed of two chromatids.

在粗线期每条染色体实际已由两条染色单体组成。

The synaptonemal complexes stretch gradually from the early pachytene to late pachytene.

从早粗线期到晚粗线期联会复合体逐渐伸长；

Prophase may be divided into successive stages termed leptotene, zygotene, pachytene, diplotene, and diakinesis.

前期可被分为连续的阶段：细线期、偶线期、粗线期、双线期和终变期。