Most suspension systems attach the shock to a moving linkage at the top, and a fixed frame mount on the bottom.
大多数避震系统将减震器上端连接在一个可移动的部件，下部则连接在固定的车架部分上。
3
The four-bar linkage included in the mechanical steering system of industrial vehicles is composed of the crank of steering gear, longitudinal connecting rod, the arm on kin pin and frame.