这是差动轮系的模型，不懂，求大神指导！！
http://image.baidu.com/i?ct=503316480&z=0&tn=baiduimagedetail&ipn=d&word=%E4%BB%80%E4%B9%88%E6%98%AF%E5%B7%AE%E5%8A%A8%E8%BD%AE%E7%B3%BB&step_word=&pn=0&spn=0&di=115426901810&pi=&rn=1&is=&istype=&ie=utf-8&oe=utf-8&in=20307&cl=&lm=&st=&cs=2991888725%2C3306904827&os=3909039994%2C1612858594&adpicid=0&ln=1984&fr=&fmq=1419061569359_R&ic=&s=&se=&sme=0&tab=&width=&height=&face=&ist=&jit=&cg=&objurl=http%3A%2F%2Fimg1.goepe.com%2F201308%2F1375502167_2835.jpg&fromurl=ippr_z2C%24qAzdH3FAzdH3Fooo_z%26e3B25jrj_z%26e3Bv54AzdH3Fwr5ss5AzdH3F5uuj6-k3ojfd-cl89cn0_z%26e3Bip4s它是怎么两个运动来确定一个运动的呀？我看着好像一个运动就能确定整个的运动了
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