Primal fear, too, was hard to eradicate.

人们对鳄鱼的原始恐惧太难根除。

Second, she thinks that he is therefore dissatisfied with her, which in turn arouses the unspoken but primal fear that he might leave her.

第二，她认为，他因此对她不满意，会反过来激起心照不宣却原始的恐惧，那就是他可能会离开她。

They work so well to set the scene because they play on some of our most primal fears of isolation and defenselessness.

他们之所以能很好地设定场景，是因为他们利用了我们对孤立和无助的一些最原始的恐惧。