He is an alert boy.
他是一个机警的孩子。
警报，红色警报；应状况He is an alert boy.
他是一个机警的孩子。
He is a man alert in problem.
他是个留意问题的人。
A sparrow is very alert in its movements.
麻雀行动非常机灵。
alert enough to spot the opportunity when it came.
当机会到来的时候充分认识到并攫住它。
the alert stance of a batter in baseball.
棒球击球手的击球姿势。
You must keep alert in class.
你们应该在课堂上保
。
The policeman alerted me to the danger.
警察警告我有危险。
He has an alert mind.
他很机灵。
A monkey is very alert in its movements.
猴子的动作很敏捷。
bird watchers on the alert for a rare species.
看守者人密切注意稀有鸟类
Drivers must be on the alert for traffic signals.
驾驶员必须密切注意交通信号。
alert to danger; an alert bank guard.See Synonyms at aware
警惕危险；警觉的银行保安人员参见 aware
schools need to be constantly alert to this problem.
各学校应该始终保对此问题的警惕。
a vibrating alert is a discreet alternative to ringtones.
相对于铃声信号而言，振动提示信号是一种谨慎的替代手段。
he alerted people to the dangers of smoking.
他提醒人们注意吸烟的种种危害。
security forces are on the alert for an upsurge in violence.
安全部队防备着冲突激化。
the force went on red alert .
部队进入红色戒备状态。
he had remained alert the whole time.
他始终保着警惕。
he put Camp Visoko on yellow alert .
他宣布维索可营地进入黄色警戒状态。
The radio alert ed the citizens to prepare for the hurricane.
电台警告市民们作好预防暴风准备。
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