C1 quick to see, understand, and act in a particular situation机警的,机敏的,敏捷的
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Doing puzzles and crosswords regularly keeps your mind alert and active.
Although Granny was frail in her old age, but was mentally very alert.
He was normally a bright, alert baby, so she felt sure there was something seriously wrong.
A small animal must always remain alert for predators.
There have been some thefts recently, so please stay alert and don't leave handbags and valuables around.
C1 a warning to people to be prepared to deal with something dangerous警报
C2 to warn someone of a possibly dangerous situation使警觉,使警惕;向…发出警报
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If you hear a flood warning, please alert your neighbours and make emergency preparations.
Until I saw my statement, there was nothing to alert me that someone else was using my credit card number.
We encourage parents to alert the school about any concerns or difficulties at home.
We don't want to alarm people unnecessarily, but they should be alerted to potential dangers.
A note of formality in his voice alerted her to the fact that others were listening.
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