In recent years, many people have been questioning whether it is worth the time and money organizations spend on trying to save endangered species.

近年来，许多人一直在质疑各种组织在拯救濒危物种上花费的时间和金钱是否值得。

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For many people, their parents' divorce marks a turning point in their lives, whether the divorce happened many years ago or is taking place right now.

对很多人来说，父母离婚都标志着他们生命中的一个转折点，不论这是陈年旧事还是此时此刻正在发生。

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Many years ago, there lived a very rich man who wanted to do something for the people of his town. But first he wanted to find out whether they deserved his help.

在多年以前，居住着一个非常富有的人，他想为城镇里的人们做些事，但他首先想知道他们是否值得帮助。

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But many non-scientists are unsure about whether humans evolved over millions of years.

VOA: special.2009.02.25

Dr George Schmid, a specialist in HIV at the World Health Organization, said it could take many years to determine whether the technique was safe and effective, but he said the results were "encouraging".

BBC: Cell infected with HIV

Furthermore, it will be many years before anyone knows whether the government's extra spending on education bears any fruit in improving work opportunities for the poorest children.

ECONOMIST: Labour��s crusade

Many critics have focused on funding, and whether the project would hold the public's attention for many years.

BBC: Applicants wanted for a one-way ticket to Mars