总感觉是齿轮在打齿的朋友可以用这款
http://m.youku.com/v_show/id_XNDU5NjA3MjIyNA==.html?pgcpgcid=UNTIwMTExMTE4OA%3D%3D&sharekey=7326a2aac47c3fb96fd8c90458d4dc2f4