他们研究动物如何保护自己免受捕食者的伤害，以及哪些动物会捕食其他动物。

They study how animals protect themselves from their predators, and which animals kill other animals for food.

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但是，在决定关闭机场时并未考虑何为危险、隐性伤害和安全间的界限以及这三种级别如何随火山灰微粒类型与数量的变化而改变的因素。

But where the boundaries between danger, potential damage and safety lie, and how they vary with the type and number of ash particles, was not taken into account in the decisions to close airspace.

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通常，临床试验确实能够提供大量信息说明一种药物对某种已确定疾病的效力如何，以及可能引起何种伤害。

Clinical trials generally do tell a good deal about how well a medicine works for a defined disease and what potential harm it may cause.

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