Recall a poem with fallen leaves in front of the door, which indicates a poem that is left out in front of the door.

The door is empty: catch it with a net. You can set up a net in front of the gate to catch sparrows. It is described as cold and few guests.

The door is like a city court: the yard; If: like it; City: market. There are many people in front of the door and in the yard, just like the market. The original description was that many people made suggestions. It is described that there are many people coming, which is very lively.

Poem: The Sad Horse in the Door —— Bai Juyi's Pipa Journey