cloudage

例句：

1. 1.The clouds were so thick that they obscured the sun.
   云层如此厚重以至于遮蔽了太阳。
2. 2. The cloudage was so dense that it blocked out the moonlight.
   云层如此密集以至于遮挡了月光。
3. 3.The weather forecast indicated a cloudage over the area.
   天气预报显示该地区上空有云层。