我的午餐半个小时前就点过了。

I ordered a lunch about half an hour ago.

youdao

吉姆半个小时前注意到了这件事。

Jim noticed it about an hour ago.

youdao

半个小时前，我听到他唱了一首英文歌曲。

I heard him sing an English song half an hour ago.

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

But I needed a full half hour before I walked into the office before I felt comfortable that I could talk to him about what happened overnight, what was in the newspaper, what his day was gonna be about.

但是在进入办公室前,我需要准备半个小时,然后我才可以,和布什谈话,谈论晚上发生的事，报纸刊登的东西，和他的一天要处理些什么。

普林斯顿公开课 - 国际座谈会课程节选