alert someone to sth

• 使 ... 警觉； 使 ... 警惕

alert someone to sth的用法和样例：

例句

1. 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。
2. The cat is alert to every sound and movement.
   那只猫对任何响动都很警觉。
3. A vigilant police force helps to control crime.
   一支警惕着的警察队伍有助于遏制犯罪。
4. He should be careful not to overvalue himself.
   他应该警惕不要过高估计自己。