1. 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。

2. 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。

3. 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。

4. 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！

5. 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，

6. At half past two the clock was still going and he again fell asleep.
    两点半时钟还走着，他便又睡下了。

7. At such times he was a most delightful companion, full of wit and humour, with a laugh that came straight from the heart.
    在这种时候，他是一位最令人愉快的同伴，睿智而具有幽默感，带着发自内心的笑。

8. And yet, only half way through the book, she´s completely broken with the old world and become a staunch fighter in the ranks of the revolution.
    但是只到了书中描写的一半，她就完全与旧世界决裂，成为了革命阶级中一名坚强的战士。

9. And then he also made the mistake of drinking not one but two frosted glasses full, while everybody else had a half-inch "just for taste."
    接着他又犯了个错误：他喝了不是一杯，而是满满两大毛玻璃杯的葡萄酒，而其他人的杯子里都只有半英寸高的酒, "只是尝尝而已。"

10. About two weeks ago, a regretful Mr. Williams, who had worked for the London police since 1959 and had risen to a ￡65,000 a year position as deputy director of finance, was brought into court and sentenced to seven and a half years in prison.
    威廉斯先生自1959年起效力于伦敦警署，官至财务部副主管，年薪65,000英镑。大约两周前，后悔不已的他在法庭受审，被判监禁7年半。