贝蒂和迈克尔互相微笑，因为只有他们知道半个小时之前发生了什么。

Betty and Michael smiled at each other, for only they know what happened only half an hour earlier.

youdao

柠檬汁和苏打粉的混合溶液就是不会产生污渍的温和漂白剂。在清洗之前，把衣服在这种溶液里浸泡半个小时即可。

For a mild, stain-free bleach, soak your delicates in a mixture of lemon juice and baking soda for at least half an hour before washing.

youdao

抵达布鲁塞尔之前半个小时请通知我一声。

Please let me know half an hour before we arrive at Brussels.

youdao

I needed about an half hour ahead start on him in the office in order to be sufficiently prepared to visit with him which I did every morning shortly after he arrived.

我需要在他之前,半个小时前就开始工作,为的是做好充分准备,跟他谈话,我每天早上,他到达办公室后都要跟他谈。

普林斯顿公开课 - 国际座谈会课程节选