n. 几何板〔供学生学习几何的一种教具，为一方形板，上面立着一排排小细柱，以橡皮筋绕在小柱上即可绕出各种几何图形〕。
A geoboard is a mathematical manipulative used to explore basic concepts in plane geometry such as perimeter, area and the characteristics of triangles and other polygons. It consists of a physical board with a certain number of nails half driven in, around which are wrapped rubber bands.
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