短语词组短語camber beam 曲線梁;彎梁;彎曲梁;曲梁connect camber beam 連接彎梁camber of beam 梁拱;梁弧高梁拱高;梁孤高camber -beam [建]弓背梁thin wall camber box beam 薄壁曲線箱梁 返回 beam camber