卷云是“一种低矮的长管形云彩，”它时而平滑，时而臃肿。
A roll cloud is "a long, low tube of a cloud," sometimes smooth, sometimes bumpy.
卷云。卷云是“一种低矮的长管形云彩，”它时而平滑，时而臃肿。上图中的卷云被称之为晨曦，它会定期形成于澳洲昆士兰的北部地区。
Roll cloud. A roll cloud is "a long, low tube of a cloud," sometimes smooth, sometimes bumpy. This one, called Morning Glory, forms regularly in northern Queensland, Australia.
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