on (the) alert
on
ɒn
on
(the)
ði
dhi
alert
əlɜ:t
ēlēt

英語での「on (the) alert」の定義と意味

on (the) alert
01

ready and watchful to respond to potential danger or change 

コロケーション
The firefighters were on the alert for new fires after the storm passed. 
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