Two boards should end lap, lap length about half the prefabricated groove for the factory.
两块板端应该搭接，搭接长度大约为工厂预制槽的一半(搭接时注意当地的常年风向)。
The single lap joint fails when the crack length reaches to the critical size.
当裂纹扩展到临界尺寸时，接头会迅速破坏。
The single lap joint fails when the crack length reaches to the critical size.
当裂纹扩展到临界尺寸时，接头会迅速破坏。
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