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關注：1
2013-05-23 12:21
求翻譯：Over 650,000 surgical procedures are performed annually for back pain in the United States that cost in excess of $20 billion per annum.是什么意思？ 待解決
 懸賞分：1
- 離問題結束還有
Over 650,000 surgical procedures are performed annually for back pain in the United States that cost in excess of $20 billion per annum.
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