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深秋时节,早晨起来,草地上一片白茫茫,那便是霜。这霜知露一样,不是从天上降下来的,而是水蒸汽遇冷(摄氏零度以下)凝结而成的。
Autumn season, the morning up, a vast expanse of grass, it is frost. This frost is exposed, not from heaven but from condensation of water vapor (below zero).