用warn about造句子，“warn about”造句

Guidelines warn about an undesirable circumstance (and are often translated to warning messages).

But Messrs Amis and Buckley are right to warn about the threat of the "silver tsunami".

Almost at the same time, environmental experts have had to warn about the state of the environment in Asia.

And those who warn about the risks of action must explain why these risks should worry us more than the certainty of continued mass suffering if we do nothing.