Two arch ribs are installed in transversal direction to form a"double bow system".
四川绵阳飞云大桥的主桥系三跨系杆拱桥，横向设两根拱肋，构成“双弓体系”。
The cancellous bone porosity basically keep constant along the transversal direction.
松质骨孔隙率在垂直于轴向的方向基本不变。
The cancellous bone porosity basically keep constant along the transversal direction.
松质骨孔隙率在垂直于轴向的方向基本不变。
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