When this happens uniformly across a large front, a roll cloud may form.
由于同时发生在一个面积广阔的锋面，于是就形成了这种卷云。
A roll cloud is "a long, low tube of a cloud," sometimes smooth, sometimes bumpy.
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.
卷云是“一种低矮的长管形云彩，”它时而平滑，时而臃肿。
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