alerter

常见例句

• One should not run about aimlessly during an alert.
  空袭警报期间不可到处乱跑。
• She is always on the alert for some new calamity.
  她总是保持警觉以防某种新的灾难。
• Keep on the alert; we're due for an inspection.
  提防着点，轮到检查我们了。
• Be sure to be watchful or alert.
  必须留神，千万要提防。
• They have put the army on the alert.
  他们已使军队进入戒备状态。
• The alert leopard went up to a deer quietly.
  警觉的豹子静悄悄地走近一只鹿。
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