Have you ever taken the subway? Do you know what subway is?
The subway is a running train under the ground. You can take it for two yuan, as long as you don't get out of the subway. There's air conditioning on the subway. It's cool! It's much better than taking a train. It's crowded and hot on the train. It's not crowded and cool on the subway!
Taking the subway does not cause traffic accidents, traffic jams, and is fast and convenient. In today's traffic jam metropolis, the subway is really a good means of transportation for people.
When I first got on the subway and heard the rumble, I looked at the advertising box outside the window. I want to develop a more comfortable and faster subway than the subway when I grow up, so that people can enjoy it.