我在这里使用了8个顶点(立方体的顶点)并使立方体的中心与坐标系的原点相重合。
I've used eight vertices (the cube's corner points) and placed the cube's center at the coordinate system's origin.
采用使两条啮合界限线重合的螺旋角度，或略小于此值，均可获得较好的啮合质量。
If helix Angle is equal to or slightly smaller than the Angle which makes two meshing boundary lines coincide with each other, preferable meshing performance is obtained.
倘若其轴线不重合，就会产生振动使轴承发热，甚至损坏泵。
If the axes don't coincide, the vibrancy will occur so that the bearing heats and the pump is even damaged.
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