adj.警戒的；警惕的
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 British Prime Minister Gordon Brown has urged people to be vigilant against the potential terrorist attack. 英国首相戈登.
n.义警警员；治安团体的成员
adv.警惕地；留心地
