What are the other ways to say metro, subway and understand in English for subway? Please give an example! 2. How are they used in sentences? Please give an example!

subway is mostly in the United States

tube in the United Kingdom

metro often refers to the London Underground

underground United Kingdom

Underground, generally Specifically refers to the London Underground. Subways in other countries and cities rarely use this, so Underground is not commonly used, and it cannot be said in other cities. If you have to say it in other places, it is best to mention Underground Railway.

At the same time, Tube also refers specifically to the London Underground in spoken language. There is no big difference between the two. For example, its official website reads: Tube｜London Underground.

Metro, originally referred to the Paris subway Métropolitain, and later spread widely throughout Europe. The word also entered English from French, so when it refers to the subway in English, it is more British.

At the time of naming, only the DC subway in the United States was named Metro. In North America, Metro also means "metropolitan area", which is the original meaning of French Métropolitain.

When some cities refer to the transportation system, Metro is not just the subway. For example, in Los Angeles Metro refers to all bus systems including buses, and bus lines are also directly called?

Metro. For another example, Beijing Metro Line 4, which has Hong Kong and British origins, also calls itself Beijing Metro Line 4, instead of calling itself Beijing Subway like other lines.

Subway is more American, but in British English most of the time it means "underpass across the street".

This is from the NYC MTA Subway. Although it is more American-style, not every city’s subway is called Subway, such as Atlanta’s MARTA, Boston’s The T, San Francisco Bay Area’s BART, and Chicago’s The L. But when you go to a certain city and say you are looking for a "Subway", people will know that you want to take the subway.

Extended information:

In the English environment, based on the development origins and usage habits of similar systems in various cities, it is often called: Metro (Paris, France, and parts of mainland China) , MRT (Singapore, Taipei, Kaohsiung, etc.), MTR (specifically Hong Kong),

Overground (specifically above-ground rail), Railway (specifically above-ground rail), Subway (United States and surrounding areas, Beijing) , Tube (specifically refers to London) or Underground (specifically refers to London)

According to the "2017 Urban Rail Transit Industry Statistical Report" of the China Urban Rail Transit Association on April 8, 2018, as of the end of 2017, A total of 34 cities (including seven types of rail transit) in mainland China (excluding Hong Kong, Macao and Taiwan) have opened urban rail transit and put it into operation, with 165 lines opened and the length of operating lines reaching 5,033 kilometers.

Seven modes of urban rail transit have been opened, including subway, light rail, monorail, urban express rail, modern tram, maglev transit and APM. Among them, 3883.6 kilometers of subway, accounting for 77.2%; 240.8 kilometers of light rail, accounting for 4.8%; 98.5 kilometers of monorail, accounting for 2%; 502 kilometers of urban express rail, accounting for 10%; modern tram The tram is 246.1 kilometers, accounting for 4.9%; the maglev transportation is 57.9 kilometers, accounting for 1.1%; the APM is 3.9 kilometers, accounting for 0.1%.

Reference material: Subway (type of urban rail transit) - Baidu Encyclopedia