Reinforced concrete and special trusses have toughened large buildings, but mechanisms that actually reduce the shake from a quake are still relatively new.

• 钢筋混凝土和特殊的桁架已使大型建筑物更坚固，但真正能减轻大楼在地震时摇晃幅度的机械装置，倒是近来才出现的。