For a brief moment during that stage of its life cycle, the tongue consists of two tiny half-tubes before merging into one.

在它生命周期的这一阶段，有短暂的一刻，其舌头由两个微小的半管组成，随后融合为一体。

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Life expectancy in its rural communities, half of which have no access to clean water, has fallen to little more than 40 over the past two generations.

有一半的当地农村人口无法获得干净的水，导致过去两代人的平均寿命跌至40岁。

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Life expectancy has dropped slightly for all Americans except for black men, who gained around two and a half months in longevity, according to a recent report.

根据最近的一份报告称，所有美国人的预期寿命已经略微下滑，只有黑人男性例外，反而增长了大约两个半月的寿命。

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From a molecular perspective, Lucentis was designed to stay in the eye and have a short half-life (two hours), while Avastin was designed to enter the circulatory system and to stick around to fight off cancer (a half-life of 20 days).

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But cesium-134, which has a half-life of only two years, clearly came from the meltdowns, the researchers say.

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Withdrawal-type symptoms typically resolve in a week or two depending on the half-life of the specific benzodiazepine involved, which suggests that at a gross level, the brain returns to normal fairly quickly.

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