back lash meaning in Chinese

背隙（齿轮，螺纹），空档
齿轮隙
轮齿隙
螺丝空挡
丝隙

The nonlinear problem is ubiquitous and is difficult to solve in electro - hydraulic servo system . it is caused by the throttling property , because of the existing of the servo valve , proportion valve and throttling valve , by the dead band , the back lash and so on
非线性是电液伺服系统中普遍存在且至今没有很好解决的问题,这些非线性主要由电液转换和控制元件(伺服阀、比例阀或节流阀)的节流特性和液压动力机构的滞环及死区等因素引起。