《礼记·少仪》
如果室内原来已经坐有尊长，则后来的人都要将鞋子脱在户外。宾主之间如果询间对方的口味嗜好，要说： 您经常吃某种食品吗？ 
问道艺曰： 子习于某乎？ 、 子善于某乎？ 
If there are elders already sitting in the room, then the latter should take off their shoes outdoors. If the host and guest ask about each other's tastes and preferences, they should say: Do you often eat a certain food?