The old bridge is unsafe, it should be condemned.

这旧桥不安全应予废弃。

The makers have recalled a lot of unsafe cars.

制造厂收回了许多不安全车。

You should not have sold the car in that unsafe condition;sooner or later your misdeeds will come home to roost.

你不该把那辆不安全车卖掉,你不端行为迟早会得到报应。

For many months local residents had been complaining that the building was unsafe, and that it was an accident waiting to happen.

几个月来，当地居民一直在抱怨这栋楼很不安全，早晚会出事。