separate the wheat from the chaff
把好的和壞的分離開來；篩出可取的或有價值的東西，并丟棄不好的或無價值的東西
口語·篩選有價值事物
英文釋義
to distinguish the valuable or important from the worthless or unimportant
例句
We need to separate the wheat from the chaff in these job applications.
典故來源
源自農業實踐，打谷時用風力將有價值的麥粒（wheat）與無用的谷殼（chaff）分離，比喻篩選精華。