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。

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The 'roll cloud' was photographed over las Olas Beach in Maldonado, Uruguay.

这张'卷云'照片的拍摄地在乌拉圭马尔多纳多的las Olas海滩。

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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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