警戒的英文：
warn
be alert for

参考例句：
  • Radar warning coverage
    雷达警戒范围
  • The police have been instructed to keep an eye out for pickpockets at the fair.
    遵照指示，警察在展览会期间警戒小偷。
  • The commander called in the second battalion's outposts.
    指挥官下令第二营警戒部队撤回。
  • The police cordon off the area to prevent loot.
    警察用警戒围住该地区以防抢劫。
  • The outlying sonar to detect,localize,and engage any submarine trying to close the convoy(Tom Clancy)
    外部声纳警戒队的任务是…发现、定位和掌握任何企图靠近护卫舰的潜水艇(汤姆·克兰西)
  • Have one's eyes wide open; be careful
    监视;警戒
  • On one's guard; on the watch
    警戒着;守望
  • Watch out for; be on the lookout for
    守望;警戒;留意;防备
  • Picket ship
    雷达警戒船
  • Extremely observant;vigilant.
    非常机警的;警戒的
warn是什么意思：
v. 警告；告诫；提醒；预告
  • They warned him to be careful.
    他们告诫过他要小心。
  • Seismal Microcosmic Warning Signs
    地震微观前兆
  • She yelled a warning to us.
    她大声警告我们。
  • They attacked without a warning.
    他们不宣而战。
  • The police are warning of possible delays.
    警方通知交通可能受阻。
alert是什么意思：
adj. 警觉的；思维敏捷的
v. 向…报警；使警觉，使意识到
n. 警戒，警惕；警报
  • Suddenly the combat alert sounded.
    突然战斗警报响了。
  • conflict alert (CA)
    碰撞警告
  • She was very brisk and alert.
    她完全是一副干脆利落、精神抖擞的神情。
  • They have put the army on the alert.
    他们已使军队进入戒备状态。
  • Don't alert the enemy.
    不要惊动敌人。

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