The caves is 30 meters underground, so it's very safe and cool.

洞穴位于地下30米，所以很安全也很凉爽。

youdao

So, that these results were so positive for something that's very safe is an impressive accomplishment.

所以，这些如此正面的研究结果，而且非常安全，真是一个令人印象深刻的成就。

youdao

But the fish and meat don't use computers or mobile phones all day and don't watch TV, so if they come from a safe place they are very safe to eat.

鱼和肉不会一天到晚用电脑或手机，也不看电视，所以如果它们来自一个安全的地方，那么食用它们也是十分安全的。

youdao

"Our goal is to make a very inexpensive stove let's say five dollars that makes very,very little smoke, so it's safe for health, diminishes global warming and diminishes deforestation.

VOA: special.2010.02.01

And so they're already very safe, very effective vaccines available for many infectious diseases.

所以这些疫苗非常安全有效,常备用来对付各种传染病

耶鲁公开课 - 生物医学工程探索课程节选

So things can be dangerous. But generally, if you're smart, I think it's a very safe place to live.

因此，危险还是存在的。但大多数情况下，只要你精明点，我认为那儿还是一个非常安全的居住地。

在上西区 - SpeakingMax英语口语达人