榫 itself is the joint of furniture parts, the material is the same, the life of the 榫 and the furniture is the same, it is not easy to rust and oxidize like the metal fittings commonly used in modern western furniture, the parts are easily damaged naturally and the furniture is scattered. Metal parts are different from furniture materials. After combination, they are hard and soft, easy to wear, easy to move, easy to fall apart, and even difficult to repair.
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