十万个为什么·科学阅读30篇（3）
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Why Do Snowflakes Always Have Six Sides?
为什么雪花总是有六个边？
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Every snowflake starts as a tiny ice crystal around a dust particle.每片雪花最初都是围绕微尘颗粒形成的微小冰晶。
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Water molecules freeze in a hexagonal pattern because of their shape and bonds.水分子因其形状和化学键而以六边形结构冻结。
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This six-sided symmetry repeats as more water vapor joins the crystal.随着更多水蒸气附着到晶体上，这种六边对称性不断重复。
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Tiny changes in air temperature and humidity make each flake unique.空气温度和湿度的细微变化使每片雪花都独一无二。
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No two snowflakes are exactly alike, but all share the same basic six-fold design.没有两片雪花完全相同，但都遵循相同的六重基本结构。
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You can see this pattern best with a magnifying glass on fresh snow.用放大镜观察新落的雪，最能看清这种图案。
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Even broken flakes often show parts of the original six-arm structure.即使破损的雪花也常保留原始六臂结构的部分。
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The hexagon shape is nature’s most efficient way to pack ice molecules tightly.六边形是自然界中冰分子紧密排列最高效的方式。