Build foundations, install floor beams, lay subflooring and erect walls and roof systems.

构建底层地板，安装地板横梁，底层地板和竖直墙壁和屋顶系统。

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Build foundations, install floor beams, lay subflooring and erect walls and roof systems.

构建底层地板，安装地板横梁，底层地板和竖直墙壁和屋顶系统。

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