“commercial and industrial waste disposal is typically charged for as a commercial service, often as an integrated charge that included disposal costs”
困惑1: charged for as a commercial service,这个服务是由disposal contractor承担吗?
困惑2:disposal costs不就是commercial and industrial waste disposal本身吗?为什么还说是成本的一部分呢?
困惑3:为什么这种行为造成了废物处理承包商只选最便宜的,不选最clean的?
谢谢老师,困惑3的原文我没有写出来。