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What is the essential difference between being a Tibetan living in China and being a China living in Tibet?

I think the first sentence means that Tibet is a part of China, just like saying that I am from Guangxi, China.

The second sentence denies that Tibet is a part of China. Although I come from China, I deny that Tibet is a part of China, just like saying that I come from China and live in new york. The essential difference is whether Tibet belongs to China.