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Snow
雪
Snow is a form of frozen water.
雪是水的固體形態，
It contains many groups of tiny ice particles called snow crystals.
是由冰結晶聚合而成的固態降水。
These crystals grow from water particles in cold clouds.
這些冰結晶來自冷云團的水粒子。
They usually grow around a piece of dust.
他們通常生長在一片灰塵周圍。
All snow crystals have six sides, but they grow in different shapes.
所有的冰晶都有6個角，但卻能形成不同的形狀。
The shape depends mainly on the temperature and water levels in the air.
而形狀主要取決于空氣中的溫度和水位。
Snow crystals grow in one of two designs—platelike and columnar.
冰晶有片狀和柱狀之分。
Platelike crystals are flat.
片狀冰晶是平的。
They form when the air temperature is about fifteen degrees below zero Celsius.
當氣溫大約是攝氏零下十五度時候它們就會形成。
Columnar snow crystals look like sticks of ice.
柱狀冰晶像是冰柱的樣子。
They form when the temperature is about five degrees below zero Celsius.
它們在大約攝氏零下五度時形成。
The shape of a snow crystal may change from one form to another as the crystal passes through levels of air with different temperatures.
當冰晶穿過不同溫度的空氣層，可以從一種形狀轉化成另一種形狀。
When melting snow crystals or raindrops fall through very cold air,they freeze to form small particles of ice, called sleet.
當正在融化的冰晶或是水滴穿過冷空氣時，就會形成雨夾雪。
