为什么寒冷地带的国家比温暖地带的国家更发达？
正文翻译
Why are colder countries more developed than the warmer ones?
为什么寒冷地带的国家比温暖地带的国家更发达？
Why are colder countries more developed than the warmer ones?
为什么寒冷地带的国家比温暖地带的国家更发达？
评论翻译
Why are colder countries more developed than the warmer ones?
为什么寒冷地带的国家比温暖地带的国家更发达？
Why are colder countries more developed than the warmer ones?
为什么寒冷地带的国家比温暖地带的国家更发达？
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