富国与穷国在死亡原因方面的主要差别是什么？
What are the main differences between rich and poor countries with respect to causes of death?
富国与穷国之间期望寿命的差异可高达40年。
Life expectancy can vary by as much as 40 years between rich and poor countries.
问：富国与穷国在死亡原因方面的主要差别是什么？
Q: What are the main differences between rich and poor countries with respect to causes of death?
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