My friends endured tremendous danger in order to help me.

为了帮助我，朋友们冒了巨大的危险。

the dangers of smoking.

吸烟的危害。

There is a real danger that some people will no longer be able to afford insurance.

有些人很有可能将再也负担不起保险了。

There was no danger that any of these groups would be elected to power.

丝毫不存在这些团体中的任何一个当选的风险。

There is some risk of the lung collapsing again, but he is out of danger.

肺部的确存在再次衰竭的危险，但他脱离危险期了。