“warn about”可以造什么句，warn about造句

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

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.

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

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