... 移指握拍：finger the grip 向前挥拍：fore swing 向后挥拍：backswing ...
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arms swing fore-backward 手臂前后摆动
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Operating multiple directional value can separately control the fore and aft motion of swing arm oil cylinder, outrigger oil cylinder or hook oil cylinder to finish working of hoisting or unloading.
操作多路换向阀可分别控制摆臂油缸、支腿油缸或锁钩油缸的伸缩运动，完成吊装或卸料工作。
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