warn

1. V-T/V-I If you warn someone about something such as a possible danger or problem, you tell them about it so that they are aware of it. 警告; 提醒

When I had my first baby friends warned me that children were expensive. 当我有了第一个孩子时，朋友们提醒我说养小孩是很花钱的。

They warned him of the dangers of sailing alone. 他们警告他独自航行的重重危险。

He warned of a possibility of a new terrorist attack. 他警告说可能会有一次新的恐怖袭击。

2. V-T/V-I If you warn someone not to do something, you advise them not to do it so that they can avoid possible danger or punishment. 告诫

Mrs. Blount warned me not to interfere. 布朗特太太告诫我不要插手。

"Don't do anything yet," he warned. "Too risky."

“先别行动，”他警告道，“太冒险了。”