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。
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。
They were constantly on the alert not to be taken by surprise.
他们一直处于常备不懈状态以防突然袭击。
Consumers also tend to be more alert on the Internet.
消费者当然也倾向于在互联网上更加谨慎小心。
The world needs to be on high alert.
世界需要高度警惕。
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。
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。
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