1. Did you serve this gentleman half an hour ago, Caroline?
    卡罗琳，半小时前你接待过这位先生吗？

2. During a single crucial three-week period during our teenage years, chemical activity in the brain is cut in half.
    我们的青少年阶段有一个为期三周的关键时期，此时脑部的化学反应活动一分为二。

3. Are you brother and sister?
    你们是兄妹吗?

4. As a rule David clocks out at half past four on Saturdays.
    每逢星期六戴维总是在四点半时在自动记时钟上签退。

5. Are you brother and sister?
    你们是兄妹吗?

6. After making a short test flight at 4,15 a.m., Bleriot set off half an hour later.
    布莱里奥凌晨4点15分作了一次短距离试飞，半小时后便正式出发了。

7. A short while ago, my sister helped me to carry one of my old bookcases up the stairs.
    几分钟前，我妹妹帮我把一个旧书橱抬上了楼。

8. ´Your sister will be here in less than an hour and we must be at the station to meet her. We are late already.´
    "再有不到一个小时你姐姐就要到这儿了，我们得去车站接她。现在就已经晚了。"

9. As the Commanding Officer explained later, one half of the station did not know what the other half was doing!
    正如指挥官后来解释的那样，基地的这半边不知道那半边正在干什么！

10. At the same time the northern half is getting less direct sunshine, because it tips away from the sun.
    与此同时，北半球由于偏离太阳，太阳照射的光线较少，