火车本应在半小时之前到达。
我是半小时之前做的。
怀特先生在半小时之前给我打电话，告之此事。
Mr White called me up on the phone about it half an hour ago.
会议已经开始了，你本来应该半小时之前就到这儿。
The meeting has already begun. You should have come here half an hour ago.
这三名宇航员在着陆的近三个半小时之前离开了空间站。
The three men had disembarked from the space station about three and a half hours prior to their landing.
一旦开始写，在没有连续写够半小时之前别让自己停下休息，更不要以语句优美与否作为判断自己写作进程的标准。
Instead of measuring your progress by how perfect each sentence is, once you start writing, don't stop until you've been continuously typing for 30 minutes.
其中绝大多数的事并不需要立刻处理，所以在不停切换、检查和回复浪费掉你一个又一个半小时之前，关掉这些软件和即时提醒。
Most of these things don’t have to be dealt with straight away, so turn off instant notifications if these make you click through and waste another half hour replying and checking around.
在他们开始捡弹珠之前，一半的人必须把他们的手浸在水中半小时。
Before they started to pick up the marbles, half the people had to keep their hands in water for half an hour.
用板材盖面团和留下它在半小时在它被使用之前。
Cover the dough with a plate and leave it for half an hour before it is used.
答案是，在上床睡觉之前，我会花点时间，大约半小时，来放松自己。
The answer - I need to soften myself up (for half an hour or so) before going to bed.
试验要求他们中的一半人要在三餐之前半小时预先喝水，而另一半人只要在吃饭之前，想象他们的胃里已经饱饱的了。
Half were asked to "pre-load" with water before meals and half were just asked to imagine that they had a full stomach before eating.
试验要求他们中的一半人要在三餐之前半小时预先喝水，而另一半人只要在吃饭之前，想象他们的胃里已经饱饱的了。
Half were asked to "pre-load" with water before meals and half were just asked to imagine that they had a full stomach before eating.
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