从支付能力原则来看，当前的农民负担不但超过了其自身的承受能力，而且还具有累退性；
Ac-cording to the principle of pay ability, the peasants'burden is not only much more, but also regressive;
当年正是对于福布斯先生提出的单一税率累退性的担忧导致其竞选失败。
It was concerns about how regressive the switch to a flat tax would be that caused Mr Forbes's campaigns to founder.
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