Until recently, the main reason for removing dams was to restore salmon runs, but it is now recognized that a more important reason to remove dams is that they are no longer safe.

直到近期，拆除大坝主要还是为了恢复鲑鱼的数量，但现在人们认识到，拆除大坝的一个更重要的原因是这些大坝已不再安全了。

youdao

youdao

In the world, more than 30% of schools do not provide safe drinking water for about 570 million children.

在世界上，超过30%的学校无法为大约5.7亿的儿童提供安全的饮用水。

youdao

Walking is safe. And,it is said be to as valuable for one's health as more intense forms of exercise like jogging.

VOA: special.2010.06.08

Congressman Boehner of Ohio. "If we abandon Afghanistan, it will return to a safe haven for the Taliban and al-Qaida to plan and execute more attacks on Americans,"

VOA: standard.2009.09.28

Unless and until the export is being driven by a desire for more efficient and safe recycling, and not a desire to avoid real costs, export is not the answer to the e-waste crisis.

FORBES: It's Easy Enough To Solve The Problem Of E-Waste

It is calling for lessons in all schools on internet safety with young people themselves sharing tips for keeping safe online and more advice for parents on how to talk to their children about the issue - just as they would about being wary of drugs or strangers.

BBC: Internet safety lessons urged for five-year-olds

Sony claimed that recordings would be safe for more than 30 years without risk of degradation.

BBC: Sony to make last MiniDisc stereo system in March