One study has calculated that the lifetime benefit to the local economy for a single additional student who completes high school is half a million dollars or more.

一项研究计算得出，每增加一名完成高中学业的学生，当地经济的终身效益将增加50万美元或更多。

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The world is unlikely to lose 100 species a day, or half of all species in the lifetime of people now alive, as some have claimed.

世界不可能象某些人宣称的那样，每天灭绝一百个物种，或在人们有生之年世界一半的物种将消失。

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Like most people, I'd never even heard of hyperparathyroidism - even though more than half a million of us will be diagnosed with it in our lifetime.

和其他人一样，我也是从未听说过甲状旁腺功能亢进这回事，尽管存在该问题的人数可能会超过50万。

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If you are a twenty-year-old male of unvarnished social aptitude, those movies will seem like much-loved classics that have eaten up half your lifetime.

NEWYORKER: Tangled Webs

Hed spent half a lifetime in the bruising business of book publishing -- much of it at the top of the heap.

FORBES: Voyage of discovery

The bottom line is that half of the entire cost now attributed to the F-35 program for lifetime operations and sustainment is the result of changes made by the government since its inception in how estimates should be calculated and what the scope of the program should be.

FORBES: Super-Weapon: Why Have F-35 Fighter Costs Increased?