Slit is an excellent channel for noise transmission, while a natural enemy of noise control.

缝隙是噪音传播的良好通道，是噪音治理的天敌。

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This yellow flower is a natural insects' enemy.

这种黄色的花是昆虫的天敌。

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Some insects have a natural camouflage which hide them from the attack of their enemy.

有些昆虫有一种天然的保护色可以防止敌人的袭击。

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To the congregation, and the crowd outside, this is an extraordinary gesture by a man assumed to be a natural enemy.

ECONOMIST: Poland prepares to bury a president

Still quoting Tom Paine: "He sees his species not with the inhuman idea of a natural enemy" you're either with us or against us, no.

NPR: Community in Action

They are not a natural enemy of the status quo.

NEWYORKER: Small Change