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我沒有圖,就用文字跟你說一下吧! 普通的鍘刀,首先三個點①刀頭也就是旋轉但是不能分開的那個地方②你手放的地方,也就是刀柄③被切割物體所在刀刃上的那個點 ①到②點的距離是動力臂 ①點③點的距離是阻力臂 (離開學校好長時間了,不知道那段距離是不是叫動力臂和阻力臂來著,不好意思.但是意思應該懂了吧,
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