The art activity and special spirit in human earlier period line of action, include the particular thought characteristic, mental state appearance the emotion consigns the way made well hermeneutic.

如《巫术说》对艺术活动与人类早期特殊的精神活动方式，包括特定的思维特征、心理状态、情感寄托方式作了充分的解释。

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In actual state, the change of the embedded point and the characteristic of the reverse catenary are taken into account. This paper will propose the concept of effective length of the drag line.

实际状态下，考虑嵌入点的变化和嵌入缆的反悬链特性，提出了拖曳缆有效缆长的概念。

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