Decreasing the piston diameter of the pump can improve the stability.
减小油泵柱塞直径对稳定性有好处；
The capacity and pressure rating can be varied easily by changing the diameter of the piston and cylinder lines.
改变活塞和缸体的直径可改变泵的压力和排量范围。
The Bore is the diameter of the cylinder. The stroke is the distance the piston travels from BDC (Bottom dead center) to TDC (top dead center). The Bore is always mentioned first.
内径指的是气缸的直径；行程是活塞从下止点运行到上止点的距离。表述时，内径总是写在前面。
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