... bakelite handle screw-driver 胶木柄螺丝刀 cross feed screw handle 横向进刀丝杠手柄 lead screw handle 丝杆把手 ...
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The crank handle is rotated to lead a screw to rotate through an umbrella wheel.
转动摇把，通过伞轮使螺杆转动。
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