[英][?l?:t][美][?l?:rt]
adj.警覺的，警惕的，註意的; 思維敏捷的; 活潑的;
n.警報; 警戒狀態;
vt.向…報警;
第三人稱單數：alerts過去分詞：alerted復數：alerts現在進行時：alerting過去式：alerted
例句:
1.
Nations prepare as world health organization raises the alert level.
國內為世衛組織提升警報級別做好準備。
2.
Security forces in india's biggest cities were put on heightened alert.
在印度各大城市，安全部隊提高了警戒級別。