The knee joint is relatively unstable because there is no interlocking of bones in the joint.
膝关节是相对不稳定的，因为没有共同联锁骨骼的研究。
According to the introduction of Yingzao Fash, the joint method of Pubofang is Goutou Dazhang structure, much like the interlocking structure in modern times.
根据《营造法式》介绍，普柏枋间的连接形式为“勾头搭掌”结构，即比较接近国外地板“锁扣”的一种连接形式。
Therefore, we can deduce that the structure of Wooden Tower may exist the grooves-and-tongues joint structure which is close to the Interlocking structure in foreign countries.
因此，我们推断“应县木塔”的结构中可能存在比较接近国外地板“锁扣”形式的榫卯结合形式。
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