而肥胖在美国各社会经济阶层的发生率并不平均，以中等和中等以下收入群体为最多。
Obesity does not occur evenly across all socio-economic strata in the U.S.; it is far more prevalent in middle to lower income groups.
不过，PC的分布并不平均：在美国每100人拥有70台电脑，而法国只有35台，巴西7台，中国只有3台。
But the PC's spread has been uneven: in America there are 70 PCs for every 100 people, compared with 35 in France, 7 in Brazil, and 3 in China.
而肥胖在美国各社会经济阶层的发生率并不平均，以中等和中等以下收入群体为最多。
Obesity does not occur evenly across all socioeconomic strata in the U. s.; it is far more prevalent in middle to lower income groups.
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