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關注：1
2013-05-23 12:21
求翻譯：during 1980s have a mean length of 12 years. Almost 8% of all patents from the 1970s是什么意思？ 待解決
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- 離問題結束還有
during 1980s have a mean length of 12 years. Almost 8% of all patents from the 1970s
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