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關注：1
2013-05-23 12:21
求翻譯：There are more than 550,000 hip fractures annually in the US. This figure is expected to double by 2040. Ninety percent of fractures occur in person aged > 50 years old.是什么意思？ 待解決
 懸賞分：1
- 離問題結束還有
There are more than 550,000 hip fractures annually in the US. This figure is expected to double by 2040. Ninety percent of fractures occur in person aged > 50 years old.
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