circle for hammer throwing 链球投掷圈
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Rotary sprayers use gear driven or impact hammer mechanisms to rotate the spray head in a circle.
使用旋转式喷雾器齿轮驱动或影响锤机制，旋转一圈的喷头。
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Two circle round hole hammer body through the distance between the meet collision equilibrium condition.
两锤体圆透孔圆心之间的距离满足碰撞平衡条件。
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