roll cloud的意思|示意

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。

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。

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。