This paper discusses the mechanism of self driving vibration in the machine tool feeding system.

讨论了机床进给系统中因运动部件移动速度较低，因而产生爬行现象的自激振动机理。

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This paper discusses the mechanism of self driving vibration in the machine tool feeding system. The moving parts with lower speed lead to the crawling phenomenon.

讨论了机床进给系统中因运动部件移动速度较低，因而产生爬行现象的自激振动机理。

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Nutrients in the ponds did not increase with the growth of fish, feeding and discharge, which indicated that the self-cleaning mechanism still support the cultured density.

在养殖周期内密养池塘中的营养物质并没有随鱼的生长、摄食量和排泄量的增加而逐渐增加，说明池塘的自净机制可以支持当前的放养量。

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Nutrients in the ponds did not increase with the growth of fish, feeding and discharge, which indicated that the self-cleaning mechanism still support the cultured density.

在养殖周期内密养池塘中的营养物质并没有随鱼的生长、摄食量和排泄量的增加而逐渐增加，说明池塘的自净机制可以支持当前的放养量。

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