Under a charge system, if the problem of monitoring discharges accurately can be solved, a firm is almost certain to have to pay the charge or to spend money to abate its pollution so as to reduce the charge.

• 按照排污收费制度，如果如何准确监测排污的问题能解决的话，那么几乎毫无疑问，这个公司要么付排污的费用，要么花钱减少污染以便减少排污收费。