rocker lever

• 平衡杆,摇臂

rocker lever的用法和样例：

例句

1. The rocker arm pivots on a shaft through its center.
   摇臂以通过它的中心为轴而旋转。
2. As one side of the rocker arm moves up, the other side moves down, just like a seesaw.
   当摇臂的一侧上升，其另一侧下降，正如一块跷跷板一样。