alert

alert

[ə'lə:t]

adj.警觉的, 灵敏的
vt.使意识到, 警惕
n.警戒, 警报

例句与用法：

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。

词形变化：

动词过去式: alerted | 动词过去分词: alerted | 动词现在分词: alerting | 动词第三人称单数: alerts |

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a.

1. 警觉的; 警惕的; 留神的[(+to)]

She is alert to every sound and movement.

她对每一个声音和动作都很警觉。

2. 机敏的, 灵活的[(+in)]

The boy was alert in answering the stranger's questions.

男孩很机敏地回答了陌生人的问题。

n.[C]

1. 警戒, 警报

2. 警戒状态; 警戒期间

She was always on the alert for some new calamities.

她总是保持警觉以防某种新的灾难。

vt.

1. 向……报警; 使警觉; 使注意[(+to)]

The doctor alerted me to the danger of a heart attack.

医生提醒我注意心脏病发作的危险。

2. 通知(军队, 船只等)待命; 通知[(+for/about)][O2]

She's alerted me for weekend duty.

她已通知我周末值班。

短语词组：

on the alert

1. 警戒着; 随时准备着

They have put the army on the alert.

他们已使军队进入戒备状态。