However, lacking of a universal and explicit concept representation makes it difficult to share and reuse course resources.
但是由于缺乏统一明确的概念表示，使得课程资源共享和重用难度大。
However, lacking of a universal and explicit concept representation makes it difficult to share and reuse course resources.
但是由于缺乏统一明确的概念表示，使得课程资源共享和重用难度大。
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