OBJECTIVE To investigate distribution of drug-fast bacteria and analyze the drug resistance in hospital infection.

目的调查医院感染病原菌分布率，分析医院感染病原菌耐药性。

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So she was thrilled and surprised when one evening she checked the latest cultures under the microscope and saw fast-moving bacteria.

所以一天晚上当她在显微镜下观察最后一块培养板时，发现了长势喜人的细菌，她当时就震惊了。

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These experimental bacteria grow fast in culture medium.

这些试验菌种在培养基里生长得十分迅速。

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But bacteria and viruses breed fast, so natural selection has time, within the span of a human life, to make a difference.

ECONOMIST: Evolution: Beetle drive | The