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关注：1
2013-05-23 12:21
求翻译：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？ 待解决
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- 离问题结束还有
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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