keep a check on

• 监视

keep a check on的用法和样例：

例句

1. He sent out a party to spy the enemy.
   他派出一个小分队暗中监视敌人的行动。
2. We must keep these people under close surveillance.
   对这些人我们要严密监视。
3. The plumber made a careful check of the pipes.
   管子工对管道做了仔细的检查。
4. I had a medical checkup before going abroad.
   我在出国前作了一次体格检查。
5. You should learn to keep your temper under control.
   你应该学会控制自己的脾气。
6. She's really had him on a string.
   她真的已完全控制了他。