求翻译：and Park used patent citations to measure the amount of technological knowledge[31] . In addition, Lee et al. [67] and Hu [68 ]是什么意思？

待解决

悬赏分：1 - 离问题结束还有

and Park used patent citations to measure the amount of technological knowledge[31] . In addition, Lee et al. [67] and Hu [68 ]

问题补充：

匿名	2013-05-23 12:21:38

匿名	2013-05-23 12:23:18

匿名	2013-05-23 12:24:58

匿名	2013-05-23 12:26:38

匿名	2013-05-23 12:28:18

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