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。
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。
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。
Scientists figure humans may be born with a fear of spiders and snakes, healthy phobias that up the odds of survival in the wild.
科学家指出对于蜘蛛，蛇类的恐惧可能是人与生俱来的，这来自于人类对自身健康的担忧，但是它能提高人类在野外生存的可能性。
Fear is one of our most basic and essential survival mechanisms, but sometimes it can overwhelm us even when a real threat doesn't exist.
恐惧反应是我们人类生存最重要基本的机制之一，但有时它会让人无法承受，即时威胁并不真正存在。
But the otters lost their fear of people, and that endangered their survival.
但是，小海獭们对人类没有惧怕之心，这使他们的生存陷入险境。
In such a situation of survival, people are on the one hand trying to shake off the shackles of freedom, on the other hand, getting rid of the fear of dependency.
在这样的生存境遇下，人们一方面力图摆脱束缚而获得自由，另一方面又恐惧摆脱对物的依附关系。
Fear is an essential part of our survival, it keeps us alert.
恐惧是生存的重要部分，他让我们保持警惕。
Fear is an essential part of our survival, it keeps us alert.
恐惧是生存的重要部分，他让我们保持警惕。
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