活塞力 压缩机的每一列中沿活塞轴线方向作用在活塞上的气体力与往复惯性力及其摩擦力的代数和
The algebraic sum of the pneumatic force acting on the piston along the piston axis direction in each column of the piston force compressor and the reciprocating inertial force and its frictional force
以上为机器翻译结果，长、整句建议使用 人工翻译 。