All this is no doubt true, but it does not explain why Americans are fatter than people in other rich countries, nor why they appear to have stopped getting fatter.
2
研究人员称他们的发现有助于解释为什么近年来美国人趋于变胖，一个人变胖可能带动周围的朋友变胖。
The investigators say their findings can help explain why Americans have become fatter in recent years - each person who became obese was likely to drag some friends with them.
3
相反，我们美国人吃得比你们中国人少，但为什么我们长得比你们中国人胖而且结实呢？
By contrast, we Americans eat less than you Chinese do, so why are we fatter and stronger than you Chinese?
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