warn
单词辨析：
指针对有潜在危险、困难等的事物提出警告，含劝告某人小心行事的意味。
They cautioned him against acting recklessly on the journey.
他们提醒他路上不要莽撞行事。
I'd caution you against undue optimism.
我奉劝你不要过于乐观。
语气较强，主要指对重要问题提出劝告、建议等。
His lawyer counselled him to do nothing.
他的律师劝告他什么也不要做。
The representatives were wise to counsel caution about miliary intervention.
代表们提出进行军事干预要慎重，这是很明智的。
Why did she counsel them to accept the settlement?
为什么她建议他们接受那个方案？
指对确实存在的危险、麻烦等予以警告，比 caution 语气更强，尤强调后果。
He warned her not to walk home alone.
他告诫她不要独自步行回家。
The police warned them not to go out at night.
警察告诫他们夜间不要出门。
He warned the tourists against pickpockets.
他提醒游客要提防小偷。
相关例句：
Analysts warned that Europe's most powerful economy may be facing trouble
分析家警告说，欧洲最强大的经济体可能将面临困境。
And you tried to warn me.
你已经试着警告我了。
He also warned of a possible anti-Western backlash.
他还警告有可能会出现对西方的强烈抵制。
But I warn you, if anything happens to alex.
但是我警告你，如果埃里克斯发生了什么。
I called to warn you.
我特地打电话来警告你。
Mr Lowe warned against complacency.
洛先生告诫说不能自满。