n.音頻鈴

One should not run about aimlessly during an alert. 空襲警報(bào)期間不可到處亂跑。

She is always on the alert for some new calamity. 她總是保持警覺以防某種新的災(zāi)難。

Keep on the alert; we're due for an inspection. 提防著點(diǎn)，輪到檢查我們了。

Be sure to be watchful or alert. 必須留神，千萬要提防。

They have put the army on the alert. 他們已使軍隊(duì)進(jìn)入戒備狀態(tài)。

The alert leopard went up to a deer quietly. 警覺的豹子靜悄悄地走近一只鹿。