过去三年来，气候变化已经成为中美双边关系的支柱。
Over the past three years, climate change has become a pillar of the U.
可以认为中美经济关系已成为全球最重要的双边关系。
The U. S. -china economic relationship has become arguably the world's most important.
可以认为中美经济关系已成为全球最重要的双边关系。
The U. S. -china economic relationship has become arguably the world's most important.
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