Getting angry is not a natural way to act, the book says.

这本书说，生气不是一种自然的行为方式。

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"It seemed like the perfect chance for natural selection to act on a population," said Dr. Ilardo.

“这似乎是自然选择在一个群体中发挥作用的完美机会。”伊拉尔多博士说。

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They are to be found in a piece of deregulation enacted decades ago on the other side of the world: America's Natural Gas Policy act of 1978.

而源于世界另一端，几十年前颁布的一份关于撤销管制规定的文件：美国1978年的天然气政策法案。

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Dense planting of a crop can also act as a natural control.

VOA: special.2009.05.26

Sometimes you can design drugs that act like a natural ligand without being the natural ligand.

有时你能设计具有天然配体功能的药物,但它不一定和天然配体相同

耶鲁公开课 - 生物医学工程探索课程节选

But when you remember that the subject at hand is actually in some way sex, then you can begin to associate the Lady's image of this moderate consumption of natural wealth - with some version of -- if this makes sense -- some version of an act of sexual consummation.

但是当你们想起,现在讨论的话题其实是性，然后你们可以将这位女士,关于适量消费自然财富的形象,与一些版本--如果那有意义-,一些版本关于性圆满的行为联系起来。

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The tiered structure also prevents erosion and provides a habitat for insects, birds and butterflies, which act as natural predators, reducing the need for pesticides.

BBC: The perfect trip: China

These act as natural filters.

ECONOMIST: What is the best way to save forests?

The island's peat and blanket bogs support wildlife and act as a natural store of potentially harmful carbon.

BBC: Peat land on Lewis