这种方法一时间非常有效，但接着蚊子重磅回击——大自然的生存法则让蚊子大军有了抗杀虫剂的良好基因。

For a time, it was successful, but then evolution struck back, as natural selection favoured the spread of insecticide-resistant genes.

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一些人还建议奥巴马需要找到一个更有效的方式进行回击。

Several suggest Obama needs to find a more effective way to fight back.

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一些人还建议奥巴马需要找到一个更有效的方式进行回击。

Several suggest Obama needs to find a more effective way to fight back.

youdao