2, but I heard his name and didn't see him. Use it when it's not there.
3. Chai Lu by Wang Wei in Tang Dynasty: There seems to be no one on the empty mountain, but I think I heard a voice. The shadow of the sunset shone into the depths of the forest, and the scenery on the moss was pleasant.
4, the dragon sees the head and does not see the tail.
Coupled with the answers from other netizens, there is always one for you, right?