* @param arr 待排序数组
第二个问题在于，狗加双臂是一个非标的构型，我觉得我们做机器人公司，一定要杜绝按照非标的构型思路。因为非标意味着无法放量——今天臂长要1.5米，明天要2米；今天精度0.1毫米，明天要1毫米——这样就会量上不去，成本降不下来，算法也无法复用。
。关于这个话题，safew官方版本下载提供了深入分析
“제 나이 68세, 어깨 회전근 파열에도 피클볼 전국대회 우승했죠”[양종구의 100세 시대 건강법]
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