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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In these cases, our fear is still motivating us to DO something to enhance our chance of survival.

在这些情况下，我们的恐惧将引领我们去做一些事提供我们生存的机会。

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Since temperature affects the gender of turtle hatchlings, scientists fear a decline in male turtles, which could threaten the survival of the species.

由于温度会影响孵化海龟的性别，科学家们担心雄性海龟的数量会因此而下降，从而威胁到整个海龟种群的生存。

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This would please linguists who fear that the spread of English imperils the survival of other languages.

NEWYORKER: Globish For Beginners

But some of the medium-sized programmes, which fear for their survival, provide an efficient service for local patients and their families who cannot afford the emotional and economic cost of travelling to some far-flung centre of excellence.

ECONOMIST: States v. Washington