短语 | on the alert |
释义 | on the alert vigilant and prepared 处于戒备状态: security forces are on the alert for an upsurge in violence. 安全部队处于戒备状态, 以防暴力升级。 on the alertwatchful 注意;留神   * Drivers must be on the alert for traffic signals. 汽车驾驶员必须注意交通信号。 |
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