For example, the high-quality steel used in automobiles ends up being melted down with paint, plastic, copper wiring and other substances because there's no easy way to separate it prior to recycling.
例如汽車的高品質鋼材，因無法與其他成分拆解分離，以致回收時被迫與其他零組件如油漆、塑膠、電纜線中的銅等一起被熔化，大大降低了鋼材品質，無法再作為新車的原料。