Arrow: Printing fault in gravure which appears as a mark in the shape of an arrow head on the print. Also called comet.

箭形印记：是照相凹版印刷的瑕疵。印刷品上带有像箭头的印纹。亦称慧星印记。

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The printing was poor and he tried to blind me with science by saying that it was the fault of the paper and not his machine.

印刷很差，但他说那是纸张的问题，而不是机器的故障，试图以此来蒙骗我。

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The function that the system realizes mainly includes: knowledge base maintenance and modification, diagnosis database importing and scanning, equipment fault diagnosing function, printing report.

专家系统实现的主要功能包括：知识库管理、事实数据录入和查询、设备的故障诊断和报表打印。

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