1、
Fees are calculated on a sliding scale according to income (= richer people pay more) .
按浮动费率制根据收入高低计算收费。
《牛津高阶英汉双解词典》
2、
Fees are calculated on a sliding scale according to income, ie Richer people pay more.
这种费用是根据收入高低滑动折算的(富人多付钱).
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