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1·They want to be on the alert for similar buying opportunities.

他们要准备应对类似的购买机会。《柯林斯英汉双解大词典》

2·Police are warning the public to be on the alert for suspicious packages.

警方警告公众要警惕可疑包裹。《牛津词典》

3·Yellow - be on the alert.

黄灯表示警告状态。

4·Drivers must be on the alert for traffic signals.

司机必须注意交通信号。

5·Drivers must be on the alert for traffic signals.

驾驶员必须密切注意信号。

6·Drivers must be on the alert for traffic signals.

驾驶员必须密切注意交通信号。

7·Every country that advocates peace must be on the alert.

每一个主张和平的国家都必须提高警惕。

8·For the former, they will not be on the alert, while the latter is often scary.

对于前者，他们不会加以提防，而对后者却常常提心吊胆。

9·We must be on the alert to discharge our responsibilities toward the friendly countries.

我们必须警惕自己放弃对友好国家的责任的做法。

10·Be on the alert for children walking in the street, particularly in neighborhoods that have no sidewalks.

有孩子行走的街道要当心，尤其是在没有人行道的街区。