隐孢子虫和贾第鞭毛虫是两种严重危害水质安全的病原性原生动物。

Cryptosporidium and Giardia axe two common species of pathogenic protozoan, seriously endangering the water quality.

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许多原生动物利用伪足、纤毛或鞭毛能运动。

Many protoctistans are motile, using pseudopodia, cilia or flagella.

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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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