n.摆线；轮转线
adj.圆形的；循环性格的
The cycloid has an isochronal pendulum. 摆线具有严格的等时摆。
The vibration performance of cycloid ball planetary reducer was analyzed. 分析摆线钢球行星传动减速器的振动特性。
n.外摆线(圆外施轮线；外圆滚线)
