求翻译：　 王府大门是屋宇式大门中的最高等级，规模大更讲究一些的王府，它的大门还不直接对着街道，而是在大门前留有一个庭院，院子前面加一座沿街的倒座房，两旁另设称为“阿斯门”的旁门.是什么意思？

Palace door is the highest rating in the door of the building services, large-scale pay attention to some of the palace, the door is not directly facing the street, but left at the gate of a courtyard, front yard and a street back seat room, on both sides an