It has been found that for the machine turning around the vertical axis is the most critical state through an practical example.

通过实例分析，得到沿垂直轴向的临界稳定状态是掘进机临界稳定状态的基本结论。

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A lathe is a machine tool for cutting metal from the surface of a round work fastened between the two lathe centers and turning around its axis.

一个车床是一种机床切削金属的外貌之间的一个圆的事变系两个车床顶心和围绕它的轴转动。

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