妇女撑开裙子下摆用的一种很轻的曲环。
A light curved frame to spread out a skirt .
九溪十八涧则以“曲曲环环路，叮叮咚咚泉”著称。
Andand eighteen dales is famous for its crooked path and tinkling spring .
面向制造的截面曲边环域光栅填充算法研究
Oriented Manufacturing Algorithm Research on Sectional Curve-edged Ring Field 's Raster Filling
曲环