4.其它平面图形
arc 弧line, straight line 直线line segment 线段 parallel lines平行线 segment of a circle 弧形
5.立体图形
cube 立方体，立方数 rectangular solid 长方体regular olid/regularpolyhedron 正多面体circular cylinder 圆柱体 cone 圆锥 sphere 球体 solid 立体的
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