cloud-cloud collision

例句：

1. 1. The cloud-cloud collision caused a sudden downpour of rain.
   云层相撞导致了一场突如其来的暴雨。
2. 2. The clouds were so thick that they looked like they were colliding with each other.
   云层如此之厚，看起来像是它们在相互碰撞。
3. 3. The cloud-cloud collision was visible from the ground, making it difficult to see the sun.
   从地面看，云层相撞很明显，难以看到太阳。