你坐过地铁吗？你知道什么叫地铁吗？
Have you ever taken the subway? Do you know what subway is?
地铁是在地底下的跑的火车，两元钱就可以随便坐，只要你不出地铁口。地铁上还有空调，可凉快了！比坐火车好多了，火车上又拥挤又热，地铁上不拥挤又凉快！
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!
坐地铁不发生交通事故，不堵车，又快又方便，在如今交通拥堵的大都市里，地铁确实是人们不错的交通工具。
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.
当我第一次坐上地铁听到轰隆隆的响声，看着窗外的广告箱，我想长大以后研制出比地铁更加舒适快捷的地铁，让人们享受。
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.