正如在其孔活塞杆，曲轴旋转，加压相反的孔反转旋转。
As the piston strokes in its bore, the crankshaft rotates, pressurizing the opposite bore reverses rotation.
卧式铣床支架的支承轴承的精度会影响刀杆的回转精度，从而影响孔的尺寸精度和圆柱度。
The precision of the support bearing of the horizontal milling machine bracket affects the rotation precision of the cutter rod, thus affecting the dimension precision and cylindricity of the hole.
阀杆的直径略小于阀体孔的直径。
The stem has a slightly smaller diameter than the valve bore.
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