累进税比单一税更难管理。

A progressive tax is far harder to administer than a flat tax is.

困难在于，累进税的管理比单一税难得多。

A progressive tax is far harder to administer than any flat tax.

可以说动那些不热心议员的是认为该税属征收于富人的累进税。

The tax could be sold to reluctant legislators as a progressive tax on the wealthy.

atoddswith 教你一招 可译为“与...想牴牾” 改译：累进税往往同高效率相牴牾。

Tax progressivity is often at odds with efficiency.

经济学家建议建议的税收体系具备三个特征：一定是累进税，也就是说将向富裕阶层征更多的税；征税不应因收入方式不同而加以区别；税收体系趋向简单化。

The economists propose a tax system with three main features.