You need to separate the wheat from the chaff.
你需要去粗取精,把有价值的和无用的区分开来。
After hours of reviewing applications, the hiring committee finally sorted the chaff from the genuinely qualified candidates.
经过数小时的审核申请,招聘委员会终于从大量不合格的申请者中筛选出了真正有资质的候选人。
《马太福音》(Matthew 3:12)中施洗约翰用 chaff 比喻将在审判中被淘汰的人:"He will clear his threshing floor, gathering his wheat into the barn and burning up the chaff with unquenchable fire."