Additionally, the practice of building with external load-bearing walls caused structures to thicken at their bases as they grew taller, reducing floor area on these desirable lower levels.

此外，修筑外承重墙的建筑习惯意味着建筑物越高，外承重墙越厚，从而减少了这些理想的较低楼层的建筑面积。

It covers the surface of your body when it combines with connective tissue to create skin, but it also lines your body cavities, and coats the internal and external walls of many of your organs.

当它与结缔组织结合形成皮肤时，它覆盖了你的身体表面，但它也覆盖了你的体腔，并覆盖了你许多器官的内外壁。