警戒的英文：
warn
be alert for

參考例句：
  • Radar warning coverage
    雷達(dá)警戒范圍
  • The police have been instructed to keep an eye out for pickpockets at the fair.
    遵照指示，警察在展覽會(huì)期間警戒小偷。
  • The commander called in the second battalion's outposts.
    指揮官下令第二營(yíng)警戒部隊(duì)撤回。
  • The police cordon off the area to prevent loot.
    警察用警戒圍住該地區(qū)以防搶劫。
  • The outlying sonar to detect,localize,and engage any submarine trying to close the convoy(Tom Clancy)
    外部聲納警戒隊(duì)的任務(wù)是…發(fā)現(xiàn)、定位和掌握任何企圖靠近護(hù)衛(wèi)艦的潛水艇(湯姆·克蘭西)
  • Have one's eyes wide open; be careful
    監(jiān)視;警戒
  • On one's guard; on the watch
    警戒著;守望
  • Watch out for; be on the lookout for
    守望;警戒;留意;防備
  • Picket ship
    雷達(dá)警戒船
  • Extremely observant;vigilant.
    非常機(jī)警的;警戒的
warn是什么意思：
v. 警告；告誡；提醒；預(yù)告
  • They warned him to be careful.
    他們告誡過(guò)他要小心。
  • Seismal Microcosmic Warning Signs
    地震微觀前兆
  • She yelled a warning to us.
    她大聲警告我們。
  • They attacked without a warning.
    他們不宣而戰(zhàn)。
  • The police are warning of possible delays.
    警方通知交通可能受阻。
alert是什么意思：
adj. 警覺(jué)的；思維敏捷的
v. 向…報(bào)警；使警覺(jué)，使意識(shí)到
n. 警戒，警惕；警報(bào)
  • Suddenly the combat alert sounded.
    突然戰(zhàn)斗警報(bào)響了。
  • conflict alert (CA)
    碰撞警告
  • She was very brisk and alert.
    她完全是一副干脆利落、精神抖擻的神情。
  • They have put the army on the alert.
    他們已使軍隊(duì)進(jìn)入戒備狀態(tài)。
  • Don't alert the enemy.
    不要驚動(dòng)敵人。

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