求翻译：Sitting motionlessly at his desk for quite a while, Robert thought hard but could not come up with a solution to the problem是什么意思？

待解决

悬赏分：1 - 离问题结束还有

Sitting motionlessly at his desk for quite a while, Robert thought hard but could not come up with a solution to the problem

问题补充：

匿名	2013-05-23 12:21:38 一动不动地坐在他的办公桌好一阵子，罗伯特认为很难，但不能拿出一个解决问题的办法

匿名	2013-05-23 12:23:18 motionlessly坐在他的办公桌前,在很长一段时间,但罗伯特·认为硬盘并没有提出一个解决方案的问题

匿名	2013-05-23 12:24:58 Sitting motionlessly at his desk for quite a while, Robert thought hard but could not come up with a solution to the problem

匿名	2013-05-23 12:26:38 一动不动，坐在他的办公桌了好一阵子罗伯特苦思，但可能达不到解决这个问题

匿名	2013-05-23 12:28:18 在他的桌子不动地坐对于片刻，罗伯特努力地想但是不能够提出问题的一种解决方案

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