Which cities in China have subway systems?
在中国有哪几个城市有地铁？
Several cities in the U. S. have subway systems, but many do not.
美国有不少城市有地铁，但是很多地方都没有。
The effective design and functional operation of fire safety measures in subway systems are discussed.
另外，还讨论了地铁系统的有效设计和火灾安全设施的正常运作情况。
The effective design and functional operation of fire safety measures in subway systems are discussed.
另外，还讨论了地铁系统的有效设计和火灾安全设施的正常运作情况。
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