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。

youdao

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。

youdao

Even though it's just six years old, Facebook has already generated a half a billion users, a lofty valuation, and a lifetime of controversy.

尽管只有6年的历史，Facebook如今已经拥有5亿用户，身价不凡，并且自始之终都备受争议。

youdao

This means that over time much smaller estates would be hit with a rate that would confiscate nearly half of a lifetime of savings or business success.

WSJ: Review & Outlook: Death Tax Made More Deadly

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

It may surprise you to know that despite all of these advantages, the average Fortune 500 is extinct in 40 years half a human lifetime.

FORBES: Three Mistakes That Cause Big Business To Die