英语语法分析

It was difficult to distinguish oogonium from spermatogonium according to the shape and size of gonium under light microscope.

在光镜下难以根据性原细胞的形态和大小区分卵原细胞和精原细胞。

We cannot be certain that Gonium, pandonina, Eudonna, and Pleodorina represent stages in the evolution of multicellular Volvox from unicellular chlamydomonas.

我们不能肯定盘藻、实球藻、空球藻和杂球藻代表从单细胞衣藻到多细胞因藻的各进化阶段。