摇臂;平衡杆

rocker lever的用法和样例：

例句

The rocker arm pivots on a shaft through its center.摇臂以通过它的中心为轴而旋转。
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。

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