2. The threshold generally refers to the threshold, which is used for laying the kitchen, bathroom floor and living room, or refers to the wooden floor of the room and the tile of the living room. In short, it refers to stones used to divide different materials or distinguish different functions. Threshold stone can play the role of moisture-proof and prevent the floor from arching. The threshold stone in the bathroom and kitchen also has the function of preventing water from flowing out. If you don't use the threshold stone, the floor of the bathroom and kitchen will fall off, forming a height difference with the entrance hall, which is not beautiful visually and inconvenient in life.