The army requires the soldiers keep vigilant at all times during special periods.

军队在特殊时期要求全员随时保持警惕。

His vigilant behaviors showed that he was a veteran man.

他警惕的行为表明他是一个老兵。

All the crew members of the airline are required to remain vigilant.

这家航空公司的所有机组人员都要求保持警觉。

A pilot must remain vigilant at all times.

飞行员必须时刻保持警惕

Renault's competitor PSA Peugeot Citroen is "extremely vigilant" about the risks of industrial espionage.

雷诺的竞争对手标志雪铁龙“极其警惕”工业间谍的风险。

A pilot must remain vigilant at all times.

飞行员必须随时保持警惕。

He warned the public to be vigilant and report anything suspicious.

他告诫公众要保持警惕，报告任何可疑情况。

Chief executive officer Grant Crothers said, "We remain vigilant with the high Australian dollar depressing returns."

首席执行官格兰特·克罗瑟斯表示：“我们对高澳元压抑回报率保持警惕。”

Parents should remain vigilant.

父母们应该保持警惕。