One fastening is an attaching fastening, wherein, two U-shaped dovetail groove tenons in reverse directions are arranged on a U-shaped block.
三是挂接连接件，是在U形块上有方向相反的两个U形燕尾槽榫。
One fastening is an attaching fastening, wherein, two U-shaped dovetail groove tenons in reverse directions are arranged on a U-shaped block.
三是挂接连接件，是在U形块上有方向相反的两个U形燕尾槽榫。
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