说明书上说我们应让它凝结四小时。

The instructions say (that) we should leave it to set for four hours.

《牛津词典》

这个体育场能在四分钟以内让观众全部散场。

The stadium can be emptied in four minutes.

《牛津词典》

该市长是否会让这座城市的危机四伏的医疗体系就此崩溃呢？

Will the mayor let the city's desperate health care system implode?

《柯林斯英汉双解大词典》

So he curses existence, curses God at having made him so impotent that he can't change the fact that two plus two equals four.

所以他诅咒生存，诅咒上帝让他如此无能,无能到无法改变二加二等于四的事实。

耶鲁公开课 - 死亡课程节选

You could think, you have to think earnings are going to go up twelve-fold to get it down to four times earnings, which will take a long, long time.

你可能会想，你必然认为收益会上涨12倍,让它回落到四倍于原来收益的地方，会花费很长一段时间。

耶鲁公开课 - 金融市场课程节选

If you make three people-- or even better, four people a day feel good and they make-- they pay it forward and make four others feel good, and so on and so on.

如果你能让三个人-,甚至四个人度过美妙的一天-,他们会推展，让四人有美好的一天，以此类推。

哈佛公开课 - 幸福课课程节选