Speaking of the subway, it can be said that many cities are built and owned. It can be said that many people have experienced the convenience of the subway, but although many cities have subways, many cities have subways that are not It's very long, and some can't even build a year. However, there are of course exceptions. The length of the subway built in some cities in a year can be said to be beyond the imagination. For example, in the city to be said today, the subway built in one year may be longer than the total length of some cities. The city is Guangzhou.