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。
The floor joist was cracked and fractured, but no debris was deposited in the basement, as the subflooring remained intact.
地板托梁破裂折断，但是在地下室并未落下碎片因地板下面安然无恙。
The floor joist was cracked and fractured, but no debris was deposited in the basement, as the subflooring remained intact.
地板托梁破裂折断，但是在地下室并未落下碎片因地板下面安然无恙。
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