7.separate the wheat from the chaff or sort the wheat from the chaff分清好坏；去芜存菁
Investors need to separate the wheat from the chaff if they want a reasonable return.投资者如果想得到合理的回报, 就需要识别优劣。
My job is to sort the wheat from the chaff so as to make life easier for the adjudicators.我的工作是理出有用的信息, 使审判官的工作更轻松。