polish up

动词 polish up:

1. bring to a highly developed, finished, or refined state
   同义词：polish, round, round off, brush up

1. I'll have to polish up my Spanish before I go to Spain this summer.
   在我今年夏天到西班牙去之前，我得提高一下西班牙语。
2. Let me polish up the handle.
   让我把把手擦亮。