地铁的一个问题每天早晨我乘地铁上学。
许多人更喜欢乘坐公共汽车、地铁甚至出租车，因为在城市的某些地方停车已经成为一个真正令人头疼的问题。
Many people prefer taking public buses or the subway or even taxis because parking is getting to be a real headache in some parts of the city.
如果一个城市能够提供好的公交及轨道交通服务设施(比如像现在的首尔那样拥有发达的地铁交通系统)，并且将这些公共交通与低价的出租车服务结合起来，那一定会解决交通问题。
If the city had a good bus and rail service, like the underground rail system in Seoul, and linked that with a cheap taxi service, it could work.
正确的认识地铁隧道的地震响应，合理的给出地铁隧道结构的抗震设计方法和安全性评价则成为一个非常重要的问题。
How to understand the seismic response of subway tunnels and given the safety evaluation for underground structure has become a very important problem.
我们可以举一个例子，更清楚地认识这一问题，如果我们把图中的顶点看成是伦敦的地铁站和纽约的地铁站，边表示连接地铁站之间的连线；
We can make this clearer by considering the graph whose vertices are the stations of the London Underground and the New York Subway, and whose edges are the various lines joining them;
我们可以举一个例子，更清楚地认识这一问题，如果我们把图中的顶点看成是伦敦的地铁站和纽约的地铁站，边表示连接地铁站之间的连线；
We can make this clearer by considering the graph whose vertices are the stations of the London Underground and the New York Subway, and whose edges are the various lines joining them;
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