distinguish valuable people or things from worthless ones去芜存菁,区分好坏
柯林斯高阶英汉双解学习词典释义
N-UNCOUNT
谷糠;麸皮
Chaff is the outer part of grain such as wheat. It is removed before the grain is used as food.
PHRASE
分清良莠;去芜存菁
If you separate the wheat from the chaff or sort the wheat from the chaff, you decide which people or things in a group are good or important and which are not.