n.卷積云

Sometimes convection at high altitudes produces another form of cirrus called cirrocumulus, a pattern of small cloud tufts which include droplets of supercooled water. 所以清晨當太陽還沒有升到地平線上或傍晚太陽已下山后，光線都會照到這種孤懸高空而無云影的卷云上，經過散射后，顯現(xiàn)出漂亮的紅色或橘紅色的霞象，在夏日的晴空中十分常見。

a sky filled with rows of cirrocumulus or small altocumulus clouds 覆蓋著卷積云或高積云的天空

1. a sky filled with rows of cirrocumulus or small altocumulus clouds. 覆蓋著卷積云或高積云的天空。

cirro-cumulus = cirrocumulus 卷積云