When heavy, stable minerals are freed from their matrix by weathering processes, they are slowly washed downslope into streams that quickly winnow the lighter matrix.

• 当比重大而又稳定的矿物受到风化作用从基质中游离出来时，就慢慢地顺山坡往下被冲刷到河里，河水则迅速把比较轻的基质漂洗掉。