alert adj.&v.&n.

adj.
1.警觉的，警惕的，戒备的
Suddenly he found himself awake and fully alert.
突然他发觉自己醒了过来，而且高度警觉。
2.意识到，注意到 alert to sth
We must be alert to the possibility of danger.
我们必须认识到危险的可能性

v.
1.向……报警，使警觉，使警惕，使戒备
Alerted by a noise downstairs, he sat up and truned on the light.
楼下的响声使他警觉，他坐起来打开灯。
2.使意识到，使认识到 alert sb to sth
They had been alert to the possibility of further price rises.
他们已意识到价格可能继续上涨。

n.
1.戒备，警惕
More than 5000 troops have been placed on alert.
5000多名士兵已处于戒备状态。
2.警报
a bomb alert炸弹警报
a fire alert火警警报

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