- 1.
使警戒,警告 -
• Mother alerted him to the danger of not getting enough sleep. 妈妈警告他要注意睡眠不足的危险性。 - 2.
通知(军队、船只等)待命，通知 -
• I'll alert him for(或about)weekend duty. 我将通知他周末值班。 - 3.
使认识到；使意识到 -
• alert teachers to their responsibility 使教师们认识到自己的责任 -
• Our visit was enough in itself to alert them that something had happened. 我们的来访本身便足以使他们感到出了什么事。