有些活动的有鞭毛的细菌在稍微潮湿的表面上扩张得很快。

Certain motile flagellated bacteria can rapidly spread over the slightly moist surface.

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单胞体单细胞的微生物，尤指单' '。'胞'。' '虫类的有鞭毛的原生动物。

A single - celled microorganism, especially a flagellate protozoan of the genus Monas.

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曾经一度认为有一个例外，是一种叫Giardia的单细胞寄生生物，常引起人体患鞭毛虫病。

There was thought to be one exception, however, in the form of Giardia, a single-celled parasite with a nasty effect on people.

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