HII cloud

例句：

1. 1.The sun was shining brightly through the HII cloud.
   阳光透过厚厚的云层，闪耀着耀眼的光芒。
2. 2.The HII cloud made it difficult to see the stars.
   厚厚的云层让星星难以辨认。
3. 3. The HII cloud was a reminder of the beauty of nature.
   厚厚的云层是大自然美丽景色的提醒。