The patrol police on duty are on the alert against any possible disturbances.
"值班巡警处于戒
状态,随时准
应付任何可
发
的骚乱。"
;随时准

The patrol police on duty are on the alert against any possible disturbances.
"值班巡警处于戒
状态,随时准
应付任何可
发
的骚乱。"
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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