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ADJ-GRADED
警覺的；警惕的；留神的；機敏的
If you are alert, you are paying full attention to things around you and are able to deal with anything that might happen.
例句
We all have to stay alert...
我們大家都必須保持警惕。
He had been spotted by an alert neighbour.
一個警覺的鄰居發現了他。
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ADJ-GRADED
充分意識到…的;完全感覺到…的
If you are alert to something, you are fully aware of it.
例句
The bank is alert to the danger.
銀行充分意識到了危險。
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N-COUNT
警戒（狀態）；戒備（狀態）
An alert is a situation in which people prepare themselves for something dangerous that might happen soon.
例句
Due to a security alert, this train will not be stopping at Oxford Circus.
由于安全戒備的原因，該次列車在“牛津街口廣場”站將不停留。
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VERB
向…報警；使警覺；使警惕；使注意
If you alert someone to a situation, especially a dangerous or unpleasant situation, you tell them about it.
例句
He wanted to alert people to the activities of the group...
他想提醒人們小心該團體的活動。
I was hoping he'd alert the police.
我當時希望他會報警。
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PHRASE
處于警戒狀態;保持戒備
If soldiers or police are on alert, they are ready to deal with anything that may happen.
例句
Soldiers and police have been put on alert.
士兵和警方都已進入警戒狀態。
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PHRASE
準備就緒；防備著
If you are on the alert for something, you are ready to deal with it if it happens.
例句
They want to be on the alert for similar buying opportunities.
他們希望隨時掌握有關類似購買機會的信息。