portal frame
柯林斯词典
1. N a frame, usually of steel, consisting of two uprights and a cross beam at the top: the simplest structural unit in a framed building or a doorway 龙门钢架[civil engineering]
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1. N a frame, usually of steel, consisting of two uprights and a cross beam at the top: the simplest structural unit in a framed building or a doorway 龙门钢架[civil engineering]