alert adj.&v.&n.

adj.
1.警覺的，警惕的，戒備的
Suddenly he found himself awake and fully alert.
突然他發(fā)覺自己醒了過來，而且高度警覺。
2.意識到，注意到 alert to sth
We must be alert to the possibility of danger.
我們必須認識到危險的可能性

v.
1.向……報警，使警覺，使警惕，使戒備
Alerted by a noise downstairs, he sat up and truned on the light.
樓下的響聲使他警覺，他坐起來打開燈。
2.使意識到，使認識到 alert sb to sth
They had been alert to the possibility of further price rises.
他們已意識到價格可能繼續(xù)上漲。

n.
1.戒備，警惕
More than 5000 troops have been placed on alert.
5000多名士兵已處于戒備狀態(tài)。
2.警報
a bomb alert炸彈警報
a fire alert火警警報

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