And so this is framing -- lumber, composite materials -- and it's kind of hard to get the embodied energy out of that, but it can be a sustainable resource We then go on to the first thing that was very surprising.
这个框架是用木头 和合成材料作成的， 所以很难收回这些能量， 如果你用F.S.C. 验证的木材 它们是可成为可持续性的能源。 我们之后发现 一件惊奇的事。