它也为人们在城市的短途旅行提供了更好的选择，特别是在人们找不到公交车或地铁可以乘坐的时候。
It also offers people a better choice for short journey in cities, especially when people can't find a bus or the underground to take.
尤其是纽约拥有的市内地铁和公交车系统就是全世界最大、利用率最高的地区之一。
New York, especially, has one of the largest and most useful subway and bus systems in the world.
许多家长有工作的孩子必须自己做地铁或者公交车去上学。
Many children who have working parents have to take the subwayor bus to get to school.
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