两国辩称，发达国家应为全球变暖负责任。
They argue that developed nations should take responsibility for global warming.
美国从欠发达国进口的商品成本都增加了。
The cost of American imports from less industrialized countries as a group is rising.
答：八国集团是发达国家合作机制，中国不是八国集团成员。
A: G8 is a cooperation mechanism for developed countries, to which China does not belong.
答：八国集团是发达国家合作机制，中国不是八国集团成员。
A: G8 is a cooperation mechanism for developed countries, to which China does not belong.
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