他们感觉处在持续不断的威胁之下。

They feel under permanent threat.

《柯林斯英汉双解大词典》

人在压力之下，办事情就容易出差错。

Things can easily go wrong when people are under stress.

《牛津词典》

他就在山顶之下放哨。

He was on the lookout just below the brow of the hill.

《柯林斯英汉双解大词典》

If these trees are still supplying shade, embowering the entire valley of Vallombrosa, the leaves haven't all fallen, of course.

如果这些树仍在为热门提供遮蔽，将整个村庄掩盖在树荫之下，这些叶子当然就还未凋落。

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And in such a hurry to get out that door that he forgets his umbrella completely.

而在他匆忙地想出门之下，他完全把带伞的事抛到脑后了。

What if 课堂 - SpeakingMax英语口语达人

Underlying it there were other things besides just the calculation of their accident rates that had certain assumptions built in.

但是我们在这些特定假设之下,计算出来的事件概率之外,还有一些事情没有反映出来

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