冰晶是霰的主要来源，而且也是霰生长的主要因素。初始的霰粒主要由冰霰自动转化生成，而较少由雨滴冻结生成。
Ice crystals are the main sources of graupels, which are produced mainly by auto conversion from ice crystal to graupel and a few grow by collection of ice crystals.
雪花并非冻结的雨滴(冻结的雨滴常称为冻雨)。
Snowflakes are not frozen raindrops (that is better known as sleet).
降水通常是由雨滴的合并作用引起的小雨或毛毛雨，因为冻结高度比较多地倾向于在逆温层之上，尤其是在夏季。
Precipitation is usually light rain or drizzle formed by coalescence since the freezing level tends to be above the inversion layer , particularly in summer.
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