bacteria n. 细菌这是细菌的复数形式，它的单数形式是bacterium。在平常的使用中我们多用复数形式。表示病毒的单词是virus，它的复数形式是viruses，直接在词尾加es。
It is known to all that bacteria are larger than viruses.
众所周知，细菌比病毒大。
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