Transition curve between the concentric circles is now circular. Also this structure avoids anti-aliasing rendering problems (double segments eliminated). 環 3D、2015、circle、Lazur、remix 206081、ring、spiral、spiral ring、URH ZD、2015、圈、天藍、混音206081、環、螺旋、螺旋環、URH 資料來源：openclipart ( https://openclipart.org/ )
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