A structural sheet iron, usually galvanized, shaped in parallel furrows and ridges for rigidity.

一种结构用条状铁，通常是镀了锌的，为防止变形而具有平行的槽和边。

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They then roll up the sheet and allow the cells to produce an interpenetrating mixture of structural support proteins, known as collagen and elastin.

之后将切片卷起促使细胞产生一种由结构支撑蛋白组成的混合物，即胶原及弹性蛋白。 纤维原细胞的问题在于它们会转化为平滑的肌肉细胞，最终将血管堵塞。

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The buildings have a structural frame made of galvanized steel and are clad in corrugated sheet metal painted black.

建筑采用了镀锌钢制成的结构框架，并且框架都包裹上了黑色波纹金属板。

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