cautioned

1. [U]小心,谨慎,慎重 being careful to avoid danger or mistakes; prudence
2. [C]警告warning

1. vt. 警告,提醒,劝…小心 warn against possible danger; warn about sth bad already done, often with the threat of future punishment for doing it again

• give sb a caution给某人一个警告

• necessary caution必要的谨慎

• caution the prisoner警告那个囚犯

• caution about sth就某事警告
• caution about the speed注意车速
• caution against doing sth警告(某人)不要做某事
• caution against the danger谨防危险

with caution adv. 慎重；留心

caution against警告；告诫

1. The teacher gave Tom a caution and told him never to do it again.
   老师给了汤姆一次警告,叫他不许再那样做。
2. He told us to proceed with caution.
   他要我们谨慎行事。
3. Always he sought someone to whom he could talk without caution.
   他一直在找一个能够随便谈谈的人。

1. I must caution you against the danger.
   我必须告诫你应谨防危险。
2. I would caution you against undue optimism .
   我奉劝你不要过于乐观.