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。
The patrol police on duty are on the alert against any possible disturbances.
"值班巡警处于状态,随时应付任何可能发的骚乱。"
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