To make the Mortgage Calculator user-friendly, I put an exception in the original MortgageCalculator class.

为了使抵押计算器具有友好的用户界面，我将在最初的 MortgageCalculator 类中加入异常（处理）。

youdao

Would provide tax credits to 10 million middle class homeowners who struggle with mortgage costs.

他将为1000万艰难支付房贷的中产阶级房主提供税收优惠。

youdao

High unemployment is spreading in New York City beyond the poorest neighborhoods to once-secure middle-class enclaves, where some residents are falling behind on rent and mortgage payments.

纽约市的高失业率正在从最贫困的社区向一度安全的中产阶级住宅区中扩散，这里的一些居民已开始拖欠租金和按揭贷款。

youdao

But for one class of investor, the mortgage pay-down is a clear winner.

FORBES: Paying for College: the Mortgage Paydown Maneuver

And the choice I make is not asking middle-class families to give up their home mortgage deduction or tax credits they get for raising their kids just to pay for a tax cut for me.

WHITEHOUSE: Remarks by the President at a Campaign Event in Miami, FL

And this makes sense, because in general, the middle class are more dependent on things like mortgage interest and state and local tax deductions than their wealthy brethren, and the elimination of those deductions would have punished those taxpayers to a greater extent than they would have benefited from the 20% reduction in their tax rate.

FORBES: Days Before Sequester, Bowles and Simpson Offer A Second Plan For Fiscal Sustainability