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中国日报网6 年
观云识天：这6种气象云帮你预知天气（组图）
On a sunny day, the sun's radiation heats the land, which in turn heats the air just above it. This warmed air rises by convection and forms Cumulus. These "fair weather" clouds look like cotton wool.
中国日报网6 年
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On a sunny day, the sun's radiation heats the land, which in turn heats the air just above it. This warmed air rises by convection and forms Cumulus. These "fair weather" clouds look like cotton wool.