问题描述：
英语翻译
The two regions were merged into a single operation under Smith,the company's former head of China and the US,its most successful market region.
还有,奇怪的是为什么最后的region没有复数?
The two regions were merged into a single operation under Smith,the company's former head of China and the US,its most successful market region.
还有,奇怪的是为什么最后的region没有复数?
问题解答：
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