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。
Drivers must be on the alert for traffic signals.
驾驶员必须密切注意信号。
Drivers must be on the alert for traffic signals.
司机必须注意交通信号。
Drivers must be on the alert for traffic signals.
驾驶员必须密切注意交通信号。
Drivers must be on the alert for traffic signals.
驾驶员必须密切注意交通信号。
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