皮尤中心设定的“中产阶级”门槛以2007年购买力平价币值计算，为自报年收入4,286元，这与世界银行所用的4,000-17,000美元的年收入范围一致。

The threshold it used for “middle-classness” was a self-reported income of $4,286 a year in 2007 PPP dollars, consistent with the range of $4,000-17,000 a year used by the World Bank.

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我花11.50加元买了半只脆皮鸭，深褐色的鸭皮闪闪发亮。

I paid 11.50 dollars for a half duck that was covered in crispy skin, glistening and deep brown.

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目的研究微元生物活性纤维对动脉化静脉皮瓣微循环的影响。

Objective To study the effect of microelement bioactivity fiber on microcirculation of arterialized venous flap.

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