短语词组短语steel structural trestle 钢结构高架桥steel arch trestle 钢拱支架;钢桁拱架steel structure trestle bridge 钢结构栈桥construction steel trestle 施工用钢栈桥shape steel trestle 型钢支架Tube steel trestle beacon 钢管灯桩 返回 steel trestle