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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。
youdao
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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。
youdao