| 释义 |
be on the alert
[英] [bi: ɒn ðə əˈlɜ:t]
[美] [bi ɑn ðə əˈlɚt]
[短语] 密切注意；警惕
词频排名 26179/55435
学习人数 21
难度等级 7/10
认知比例 62.50%
例句
Drivers must be on the alert for traffic signals.
驾驶员必须密切注意交通信号。
"Hearing this, I was on the alert instantly."
我一听这话，当下就警惕起来。
She was on the alert for some new calamities.
她保持警觉以防某些新的灾难。
助记
联想
be on (one’s) guard警惕，防范
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