当布丽吉特出去时，她发现老人正忙着沿墙安装一根新梁。
When Brigida went out, she found the old man busy with putting a new beam along the wall.
你可以在树屋的每一侧安装一套有缆绳和螺栓的昂贵系统，或者安装一个房屋专用的自由浮动梁。
You can either install an expensive system of treehouse cables and bolts or rig your own free-floating beam.
隔断墙的安装和外墙一样，在托梁间需要的位置钉木钉。
Frame partition walls as you did the outside walls, again installing blocking between joists wherever it's needed.
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