alert always [计] 随时报警
- Dogs are always on the alert wherever they go.
无论在什么地方,狗总是处于警觉状态。 - She is always on the alert for some new calamity.
她总是保持警觉以防某种新的灾难。 - They are always on the alert for traffic signals.
他们总是很留心交通信号。
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