half life
半衰期：放射性物质的放射性衰变减少一半所需的时间长度。
常用释义
英式发音
美式发音
基本释义
- 半衰期：放射性物质的放射性衰变减少一半所需的时间长度。
例句
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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。
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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。
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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。
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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。
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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。
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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。
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7·The match finally came to life in the second half.比赛在下半场终于精彩起来。来源: 《牛津词典》
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8·You are the true other half of my life.你是我生命中真正的另一半。
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9·My life will pick me up in half an hour.我妻子在半小时内会来接我。
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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！