补教；补学to make up missed lessons; to catch up on a missed lesson

• 给学生补课

  give students an extra lesson to make up for one they missed

重做to redo

喻指弥补某些工作或事情的不完善、有漏洞之处to make good a job done badly

• 一些城市功能还不完善,需要补课的地方还很多。

  Some functions of the city are not perfect. Many areas still need to be completed properly.

• 绿化不配套必须“补课”。

  Inconsistent planting of trees and flowers to make places more green must be completed properly.