The human brain needs to be without oxygen for only four minutes before permanent damage occurs.

人脑缺氧只需4分钟就会造成永久性损伤。

《柯林斯英汉双解大词典》

It's vital these children are helped before lasting damage occurs.

在持续伤害发生前帮助这些孩子才是最重要的。

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They now aim to pinpoint how and where the earliest damage occurs.

他们的目的旨于指出早期损伤是如何发生以及在哪发生的。

youdao

And number two because of the inevitable collateral damage that occurs from even the most carefully planned and skillfully executed military operations,".

VOA: standard.2009.10.21

The meager payment is largely the result of an insurance calculation which pays off based on the stage of crop development that has been achieved when the damage occurs.

CNN: farmer plows

And in an effort to cut down on injuries on the court or the field, Dr. Timothy Hewett, who heads the project at OSU's Wexner Medical Center, and his team have developed simple screening tests to better determine who is at risk for certain problems before damage occurs.

CNN: Keeping the world's Kevin Wares injury-free

She said it may be possible to retain more brain cells by preventing the brain damage that occurs during a person's lifetime.

BBC: Alzheimer's 'link' to small heads