求翻译：of the R&D performed by all US Compustat firms, 77% of all R&D-reporting firms listed in Compustat and 62% of all patents issued是什么意思？

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悬赏分：1 - 离问题结束还有

of the R&D performed by all US Compustat firms, 77% of all R&D-reporting firms listed in Compustat and 62% of all patents issued

问题补充：

匿名	2013-05-23 12:21:38

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匿名	2013-05-23 12:28:18

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