往复质量 meaning in English

reciprocating mass
reciprocation mass

So , with the reciprocal mass of this combinational equipment , the dynamic unbalance of the crank has the special status in the field of the unbalance theory
由于有往复质量的影响，曲柄连杆机构不可能达到完全的平衡，有其特殊性，因此其理论在动平衡领域内占有特殊地位。
So , with the reciprocal mass of this combinational equipment , the dynamic unbalance of the crank - connecting rod mechanism has the special status in the field of the unbalance theory
由于有往复质量的影响，曲柄连杆机构不可能达到完全的平衡，有其特殊性，因此其理论在动平衡领域内占有特殊地位。