n.擺線；輪轉線
adj.圓形的；循環(huán)性格的
The cycloid has an isochronal pendulum. 擺線具有嚴格的等時擺。
The vibration performance of cycloid ball planetary reducer was analyzed. 分析擺線鋼球行星傳動減速器的振動特性。
n.外擺線(圓外施輪線；外圓滾線)
