We sometimes say the lion is "the king of the jungle" because it is stronger and more dangerous than the other animals.

我们有时说狮子是“丛林之王”，因为它比其他动物更强壮、更危险。

youdao

This fear mechanism is critical to the survival of all animals, but no one can say for sure whether beasts other than humans know they're afraid.

这种恐惧机制对所有动物的生存都至关重要，但没有人能肯定人类以外的动物是否知道自己在恐惧。

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Many of the mammal bones collected from Herto bear cut marks from stone tools. It is impossible to say, however, whether the people were hunting the animals or scavenging the kills of other predators.

从赫托收集的很多哺乳动物骨骼上都有石制工具留下的切痕，但我们不知道这些动物是被赫托人猎杀的还是被其他食肉动物杀死后留给赫托人的残羹冷炙。

youdao

They say there are other reasons why the large animals and people from that period disappeared.

VOA: special.2009.01.20

Other cloning attempts have ended in malformed animals and experts say the technique fails in 97 percent of cases.

CNN: Team to attempt human cloning