preferential rate

基本解释

Mr Romney has pledged not to raise the preferential rate on capital gains and dividends;
罗姆尼已保证不会提高资本收入和股息的税率；
Venezuela devalued the bolívar for the second time in a year, abolishing a preferential rate of 2.6 bolívares to the dollar and unifying the official exchange rate at 4.3.
委内瑞拉贬低玻利瓦尔汇率，这已经是一年中的第二次。这次废除了原来1美元对2.6波利瓦尔，并将官方汇率定在1美元兑换4.3强势玻利瓦尔。
The maximum maturity of housing loans was extended from 15 years to 20, and a six-month preferential rate is applied.
把居民住房贷款年限从15年延长到20年，执行半年期贷款的优惠利率。

If there is going to be a preferential rate for capital gains, people are going to try to structure as much of their income to take the form of capital gain as possible.
FORBES: Carried Interest Debate Heats Up Without Much Light
The claim is that a preferential tax rate is a subsidy: renewables have preferential tax rates therefore they are receiving this subsidy.
FORBES: National Geographic's Howling Ignorance About Fossil Fuel Subsidies
The basic contention is that enjoying a preferential tax rate is equal to receiving a subsidy.
FORBES: National Geographic's Howling Ignorance About Fossil Fuel Subsidies