体型大的狗的开销的确大的多，而且它们的平均寿命也不会比体型中等的狗短多少。
Big dogs tend to cost a lot more, and their average life expectancy isn't much shorter than a medium dog's.
包括高管和运动明星收入的平均工资水平的增长速度比中等收入水平快。
Mean wages, which include the earnings of chief executives and sports stars, have risen much faster than the median.
增长差距导致大多数获取平均收入的美国人在居住地买不起中等售价的房屋。
The gap led to the inability of most Americans earning the average income to purchase a median priced home in their area.
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