First, we have Discussions, which are threaded topics that one might find on blackboard systems or other Web sites that support a distributed community.
首先，我们有Discussions，它是可以在黑板系统或其他支持分布的团体的Web站点上找到的主题。
Because the traditional blackboard model is based on serial hardware environment, its efficiency and reliability is limited and lots of expert systems based on the model can't be put into use.
由于传统的黑板模型是基于串行硬件环境之上的，因此其效率和可靠性受到极大限制，使以此模型为结构的很多专家系统无法实用化。
As the traditional blackboard model is based on serial hardware, its efficiency and reliability are limited. Also many expert systems based on blackboard model can not be put into use.
由于传统的黑板模型是基于串行硬件环境之上的，因此其效率和可靠性受到极大限制，使以此模型为结构的很多专家系统无法实用化。
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