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1·A lack of imagination is lack of the half life of beauty.

缺乏想象力就缺少了生命中一半的美。

2·In lots of cases, it's useful to define what's called a half life. It's just useful.

很多情况下有必要，定义一个称为半衰期的量，这个量很有用。

3·Unlike radioactive iodine, which has a short half life, cesium lingers in the environment.

碘驻留期短一半，而铯则悬浮在环境中。

4·Now, we also can usefully look at the half life, in this case, in the case of first order kinetics.

现在我们看看，这个一阶反应的半衰期。

5·Most people are not aware that caffeine has a half life of up to eight hours and can affect not only your ability to fall asleep, but also the quality of sleep you are getting.

大多数人都不知道，咖啡因有一个长达八小时的半衰期，不仅会影响你的入睡能力，而且还会影响你的睡眠质量。

6·Most famously, uranium-238 decays into lead-206 with a half life of 4.5 billion years, though radioactive rubidium and samarium are also useful for dating things billions of years old.

最为有名的就是铀- 238衰变为铅- 206的半衰期为45亿年，当然放射性铷和钐也同样对测算几十亿年前的物体的年龄很有用。

7·The match finally came to life in the second half.

比赛在下半场终于精彩起来。《牛津词典》

8·You are the true other half of my life.

你是我生命中真正的另一半。

9·My life will pick me up in half an hour.

我妻子在半小时内会来接我。

10·One is not offered a beautiful princess and half a kingdom every day of one's life!

一位美丽的公主和半个王国，这真是千载难逢的机会！