In the centre of the capital and the neighbouring towns the buildings are too often made of weak concrete, cut with sand and lacking the steel rods that would fortify them against shocks.
首都中心以及周边城镇的建筑都由一些劣质的混凝土与沙混合组成，缺乏用来加固建筑以防地震的钢筋。
Osteoarthritis occurs when the fibrils are disrupted or lost - just like concrete without the steel, the cartilage becomes mechanically weak and susceptible to wear and tear.
当原纤维遭到破坏或者缺失就像混凝土缺少钢筋一样，骨性关节炎就会发生。软骨的机械性变弱易于磨损和撕裂。
Durability resistance at the section corner is relatively weak in the concrete bridge, therefore, the section corner is the key place of the durability maintenance.
混凝土桥梁的梁体截面角区及立柱截面角区的耐久能力相对较弱，是耐久性维护的关键部位。
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