a fallen angel的用法和样例：
- There's a picture here of an angel flying into the heavens. Actually, Now it looks more like a fallen angel.
- You've been a fallen angel Ripped out of the sky But as your wings grew strong enough You left me - behind to die.
- By sacrificing enough blood, the caster shatters the infernal prison of a Fallen Angel, allowing it to reascend to the Earthly Spheres.
- The malformation of his knee is caused by a fall.
- A fall of rocks blocked the road.
- The car was pinned under a fallen tree.