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TOEFL BNC: 4966 COCA: 5318

alert

1 alert ˈlɚt/ adjective
1 alert
ˈlɚt/
adjective
Learner's definition of ALERT
[more alert; most alert]
: able to think clearly and to notice things机敏的;机警的;警觉的
often + to

— alertly

adverb

— alertness

noun [noncount]
2 alert ˈlɚt/ noun
plural alerts
2 alert
ˈlɚt/
noun
plural alerts
Learner's definition of ALERT
[count] : something (such as a message or loud sound) that tells people there is some danger or problem : an alarm or signal of danger警告;警报;警示信号
[noncount] : the state of being ready for something you have been warned about (such as an attack)警戒;警惕;戒备used with on与On连用
see also red alert

on the alert

: looking for or expecting something (such as danger or an opportunity)警戒状态;密切注意着
often + for
3 alert ˈlɚt/ verb
alerts; alerted; alerting
3 alert
ˈlɚt/
verb
alerts; alerted; alerting
Learner's definition of ALERT
[+ object]
: to give (someone) important information about a possible problem, danger, etc. : to warn (someone)向…报警,使警觉;使警惕
: to make (someone) aware of something提示,提醒(某人)
often + to

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