提防 on the alert

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1.

Passengers on buses should be on the alert against pick-pockets.

公共汽车上的乘客应提防扒手。

bbs.ebigear.com

2.

Scientists then can train people who fall often how to be on the alert .

然后，科学家就能告诉那些经常摔倒的人该怎样小心提防。

blog.sina.com.cn

3.

While the bees are making honey , they are on the alert for intruders and will sting anyone who draws too near .

在制造蜂蜜时，蜜蜂会时刻提防入侵者，它们会蛰任何靠得太近的人。

edu.sina.com.cn