香烟包装上有一个警告，写着‘烟草严重危害健康’。

There's a ___warning on the cigarette packet that says 'Tobacco seriously damages health'.

炸弹在完全没有警告的情况下落下。

The bombs fell completely without ___warning.

政府今天发布了一个关于日光浴危险的警告。

The government have today issued a ___warning about the dangers of sunbathing.