◆on the alert保持警惕
Prepare for action and be on the alert.准备行动, 保持警惕。
to be on the alert for sth
(looking for)+ opportunity留心某事物；注意某事物
We are on the alert for new opportunities.我们留意着新的机会。
(watching out for)+ danger, attack防备某事物；警惕某事物
They want to be on the alert for similar buying opportunities.他们希望及时关注到类似的购买机会。