It's not safe to walk the streets at night.

夜间在街上走不安全。

《牛津词典》

The street is not safe for children to play in.

孩子在大街上玩不安全。

《牛津词典》

'I'm not safe here, am I?' she asked in a quavering voice.

“我在这里不安全吧？”她用颤抖的声音问道。

《牛津词典》

Cassava has many food uses but the plant is not safe to eat unless it is specially prepared.

VOA: special.2010.06.08

Today we know, for example, if you can put one certain kind of element in your mouth or eat that, it doesn't necessarily mean you want to put the element next to it and your mouth as well, that might not be safe.

现在我们知道了，比如，即使你能把某一种元素放进嘴里,或者吃下去，这也并不一定意味着,你会把它邻近的元素也吃进嘴里,这可能会有危险，但。

麻省理工公开课 - 化学原理课程节选

Well, not everybody, but everybody can use to keep emails safe, just like sort of a really easy thing to do.

嗯，不一定是所有人，但是每个人都可以轻而易举地用这种密码来保证自己邮箱的安全，

积极参与俱乐部活动 - SpeakingMax英语口语达人

But no, your money is not safe in the sense that it's insured by the government.

NPR: Listeners' Money Questions Answered

But even these hardy people were not safe as the sea swept into Heacham and Snettisham.

BBC: Heroism and tragedy in Norfolk, Suffolk and Essex flood

"After a while the pigeons realise it's not safe to be there, " he said.

BBC: Hawks to scare pigeons at Swindon library