Stagnating middle incomes in the US date back to the mid-1970s.

美国中产阶级收入的停滞开始于十九世纪七十年代中期。

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By creating a strong middle class and raising incomes, we have given our citizens a powerful stake in their society.

通过夯实中产阶级和提高工资收入，我们已经给予人民在社会中很大的奖励。

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"Finally Nick Clegg has woken up to the squeezing of people on middle incomes, " he said.

BBC: Clegg: Raise tax threshold further and faster

Mr Speaker, I want to help families on low and middle incomes as soon as possible.

BBC: Full statement: Tax changes

"When the Tories talk about aspiration, they mean looking after their friends at the top, whilst people on low and middle incomes can go whistle, " he said.

BBC: Cameron speech: We are here to fight