名词
中文翻译：地铁网络
同义词：
['metro network', "subway system例句：1. The subway network is the backbone of the city's transportation system.（地铁网络是城市交通系统的骨干。）"]
例句：
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1. The subway network is the backbone of the city's transportation system.
地铁网络是城市交通系统的骨干。
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2. The subway network connects all major cities in the country.
地铁网络连接了该国的所有主要城市。
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3. The subway network is expanding rapidly, providing more and more people with convenient transportation options.
地铁网络正在迅速扩张，为越来越多的人提供了便捷的出行选择。