amoeba造句

The amoeba is a very simple organism.
变形虫是很简单的生物体.

An amoeba forms a cyst when conditions are unfavourable.
当环境不利时,变形虫产生包囊.

The amoeba, a denizen of fresh water, is such a case.
变形虫, 一种淡水生物, 就是这种情况.

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