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alert是什么意思?

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alert是什么意思?
adj.警觉的,灵敏的
n.警戒,警报
vt.警惕,使意识到
Troops are on the alert against any possible aggression.
军队戒备着可能的来犯.
The alert leopard went up to a deer quietly.
警觉的豹子静悄悄地走近一只鹿.
Although he's over eighty his mind is still remarkably alert.
他虽已年过八十,但头脑仍然十分机敏.
An alert listener will have noticed the error.
耳朵尖的人能听出这个错.