英语语法分析

Only the dorsal lip of the blastopore could induce altered development in the host.

只有胚孔的背唇能够诱导宿主发育的改变。

In contrast, the optic vesicle of S. kneri in Xinfengjiang River Reservoir and S. scherzeri in the Jialing River appears after the closure of blastopore.

嘉陵江大眼鳜视泡出现在胚孔封闭前，而鳜和斑鳜视泡出现在胚孔封闭后。