Perceptual grouping refers to the human visual ability to extract significant image relations from lower-level primitive image features without any knowledge of the image content.

感知归类是指人们在不拥有任何图像内容知识的前提下，从底层原始图像特征中提取有效的图像联系的一种视觉能力。

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They must have not only theory and knowledge, but also administrative technique ability such as skill of technology, of human relations, of concept and of dealing with crisis.

教学管理人员不仅必须具备一定的理论和知识水平，更要掌握一定的管理技能，主要包括技术技能、人际技能和概念技能，还应具备处理突发事件的技能。

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