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alert/
ə'ləːt
/
1.adjective
(wide awake) 警觉的
2.adjective
alert to sth (danger，opportunity) 对某事警觉
3.noun [c]
a security alert (situation) 安全警戒
4.vt.[+authorities] [ police]
使警觉
to alert sb to sth
使某人对某事警觉
on the alert (for sth)
(对某事)警觉
on alert
警惕着
to give the alert
发出警报