时间，半期的是大约1秒，12秒，分钟小时和天。

And the time half-lives are 1 second roughly, 12 seconds, minutes, hours and days.

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结果表明，男童的青春期年龄在过去15年已经下降了三年半，再一次印证了对唱诗班男童的研究。

It showed that the age of puberty had dropped by three and a half months over 15 years, reinforcing the results of the choirboy study.

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尽管营养不良很少被当作直接的死因，但超过一半的儿童期死亡与营养不良有关。

Malnutrition is estimated to contribute to more than one third of all child deaths, although it is rarely listed as the direct cause.

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