weed out

动词 weed out:

1. remove unwanted elements
   同义词：comb out

1. The new conductor start by weed out the weaker player in the orchestra.
   管弦乐队新来的指挥一上任就先把较差的演奏人员清除出去了。
2. He weed out one by one the book he do not want.
   他把不想要的书一本一本丢掉。