That would mean having PE for a half hour every day.

这意味着每天有半小时的体育课。

Hours: 10 am-4 pm including a half-hour lunch break.

时间：上午10点至下午4点，包括半小时午休时间。

Every half hour, the water bowl becomes full and sinks completely.

每隔半小时，碗就会盛满水，然后完全沉下去。

The office is a half-hour drive away.

办公室离这里有半个小时的车程。

About a half-hour to an hour is advisable.

半个小时到一个小时便可以。

About a half hour ago.

大约半个小时前。

The half-hour one is fine.

我做半个小时的。

It's a half-hour drive from here.

从这里驾车需半个小时。

The ferryboats run every half hour.

渡船每半小时开一班.

The police arrived a half-hour later.

半小时后警察来了。