常見例句Sometimes these clouds are so extensive that they are virtually indistinguishable from one another, forming a sheet of cirrus called cirrostratus. 卷雲(yún)是高雲(yún)的一種,是對(duì)流層中最高的雲(yún),平均高度超過6000公尺。cirrostratus nebulous 薄幕卷層雲(yún)cirrostratus nebulosus 薄幕卷層雲(yún)cirrostratus cloud 卷層雲(yún) 返回 cirrostratus