User charges are seldom employed to the extent possible or desirable.
使用者税很少能运用到可能或应该的程度。
Very difficult to design good user charges and produce non-revenue benefits.
良好的使用人头税设计起来非常困难，不能带来非收入利益。
It shall not include subsidies to inputs or operating costs, or preferential user charges.
支出不得包括对投入或运营成本的补贴或优惠使用费。
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