短語詞組短語put on the alert 処於戒備狀態(tài)be on the alert 在警惕中的;注意;提防;警戒Keep on the alert 提防著點Battle Fortress on the alert 戰(zhàn)鬭要塞警戒之中be on the alert for 警戒;戒備to be on the alert 警惕be always on the alert 一種軍事思想;常備Always Be On The Alert 常備不懈not be on the alert 沒有防備 返回 on the alert