层进式倍投法简介：No one has knocked on the door of this castle for a long time. The servants here all live in cabins in the castle manor. Even if they want to come in, there is no need to knock on the door.
No one has knocked on the door of this castle for a long time. The servants here all live in cabins in the castle manor. Even if they want to come in, there is no need to knock on the door.
