Manufacturers of the early 1900 s were using steel pipe, angle or channel for the greenhouse superstructures.
二十世纪初期制造商们就已用钢管 、 角铁以及槽钢之类的材料建造温室的上部结构.
辞典例句
Ships, Offshore and Marine Strutures : Above and below - water hull areas; Decks and superstructures; Multi - purpose repair coating.
船舶 、 海上和船舶结构: 水上和水下船壳部位; 甲板和上层建筑; 多功能维修用涂料.
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