伦敦爆炸案提醒我们,在恐怖主义泛滥的年代里,可以说没有一座城市是安全的,我们应该从加强城市安全着手,特别是从相对薄弱的大容量公共交通系统的安全隐患着手。地铁是城市中的大容量快速交通工具,也是一座城市的现代化标志之一。地铁系统的完善和密集度代表着一座城市的经济能 The bombings in London remind us that in the era of terrorist proliferation, no single city can be said to be safe and we should start with strengthening urban security, especially with regard to the security risks of relatively weak mass transit systems. The metro is a large-capacity fast-moving vehicle in the city and one of the city’s modern symbols. The sophistication and concentration of the subway system represent the economic energy of a city