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》

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》

Our company has informed us that there have been many cases of piracy, and warned us to be on the alert .

公司已经通知我们，最近连续发生多起海盗袭击船舶事件，因此要求我港提高警惕。

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General Fonseka,in the letter, says Sri Lanka asked India on October 15 to place troops on alert in case they would be needed to intervene to foil a coup on the island.

VOA: standard.2009.11.14

Planned Parenthood has to be on the alert already given the episodes over the last month.

FORBES: Planned Parenthood Opponents Want to Recruit High School Videographers

You can be the one to be on the alert for their financial safety.

FORBES: The Case of the Missing Cash

He said he had warned all his employees to be constantly on the alert.

NPR: Texas DA Slain In His Home; Had Armed Himself