adj.警戒的；警惕的
用作形容词 (adj.) We must keep an vigilant eye upon imperialism.
我们必须对帝国主义保持警戒。
A pilot must be vigilant at all times.
飞行员必须随时保持警惕。
The night shift has to be doubly vigilant.
值夜班要加倍警惕。
The British Prime Minister Gordon Brown has urged people to be vigilant against the potential terrorist attack.
英国首相戈登.
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