在其接缝处，允许木材移动，也允许木板上出现自然的裂缝和波动。
It is butt jointed to allow the timber to move and natural cracks and undulations to appear across the boards.
结果仍然是一个长方形的袋子，但在一，背面角度移动的接缝。
The result is still a rectangular bag, but with the seams shifted at an Angle on the back.
可靠的连接性能：PE管热熔或电熔接口的强度高于管材本体，接缝不会由于土壤移动或活载荷的作用断开。
Reliable connectivity: PE pipe hot melt or fused interface strength is higher than the pipe body, joints will not load due to soil movement or the role of living off.
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