dì
tiě
1
subway
2
metro
我每天都乘地铁上班。
I ride the subway to work every day.
地铁车厢里不可以吃东西。
You may not eat inside the subway car.
地铁站在哪里?
Where is the subway station?
高铁不是很高的地铁。高铁是很快的火车。
"gāotiě" is not a tall subway, it's a fast train.