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hexagons
A hexagon is a shape that has six straight sides.
The symmetry of the crystal is explained by the shape of water molecules, which link to form hexagons.
该晶体的对称以链接成六边形的水分子来解释。
As a matter of fact there are twelve pentagons and twenty hexagons.
事实上，共有12个五边形和20个六边形。
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