equal arclength等: class; grade; rank弧: arc bow长: older; elder; senior等弧长分段: equal arc length segments弧长: arc gap; archway length; arclength; bogenlaenge arc length; length of arc; lengthofarc; radian length下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:等弧长，即可在微信中查询翻译
