Which cities in China have subway systems?
在中国有哪几个城市有地铁？
The complexity of subway systems around the world is mind-boggling.
全世界地铁系统错综复杂，令人眼花缭乱。
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。
In a country where even subway systems have Facebook pages, news networks must fight to hold onto people's attention.
在一个甚至地铁里都能看Facebook页面的国家，新闻网路必须紧紧的抓住观众。
Mapping offers a comprehensive study of all areas of cartography from nautical charts to subway systems, from web sites to calendars.
映射提供了各方面的综合研究海图制图从地铁系统从网站历法。
The creators studied the work of subway systems, developed new methods of shooting, made unique scenery and found special equipment and locations.
创作人研究了地铁系统的运行后开发出了新的拍摄方法，他们使用了独特的布景并建造了专门设备与场所。
First, the subway systems in the six cities were opened in time sequence with London being the earliest (in 1863) and Los Angeles the latest (in 2001).
首先，这六个城市的地铁系统是按年代顺序开通的，其中伦敦是最早的(1863年)，而洛杉矶是最晚的(2001年)。
Complex network can be tangible objects in the Euclidean space, such as electric power grids, the Internet, highways or subway systems, and the neural network.
在欧氏空间中复杂网络可以是有形物体，如电力网、互联网、高速公路或地铁系统、甚至神经网络等等。
Mr. Li continued, "Together with the completion of our acquisition of Digital Media Group earlier this year, this contract helps to solidify our leadership position on subway systems nationally.
李利民补充道，“加上今年初本公司完成对数码媒体集团的收购，这份合约有助于巩固我们在全国地铁系统的领先地位。
Mass-transit systems across the world responded to the Moscow subway attack by heightening security.
莫斯科地铁受到袭击后，全世界的公交系统都作出反应，加强了安全保障。
Naturally, we were excited to hear that JR East will be installing these systems in the floor of one of busiest subway stations on the planet.
很自然的，我们很高兴听到东日本铁道公司将在全球最繁忙的地铁站的地板上安装这种系统。
New York, especially, has one of the largest and most useful subway and bus systems in the world.
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。
Top contact systems with protective covers over them, like the New York Subway (photo left), needed radially mounted shoes anyway to allow them to fit under the cover.
例如纽约地铁(如下图)的带防护罩的上触式系统，总之需要放射状放置集电靴来使它们在盖下适合。
The protection and control system in subway DC power supply systems play a key role in ensuring the safety and reliability of the subway.
地铁直流供电的保护与控制系统对确保地铁的安全可靠运行起着关键作用。
Undergirding the city is a patchwork of supersize infrastructure — huge airports, subway lines, sewage systems and power plants.
由大型机场、地铁、污水处理系统、发电厂等超大规模的基础设施构成的网络，为这座城市提供了有力的支撑。
Undergirding the city is a patchwork of supersize infrastructure — huge airports, subway lines, sewage systems and power plants.
由大型机场、地铁、污水处理系统、发电厂等超大规模的基础设施构成的网络，为这座城市提供了有力的支撑。
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