n. an electric railway operating below the surface of the ground (usually in a city)
n. 地铁
1. I take the metro to work every day.
我每天乘地铁上班。
2. The metro is usually faster than driving in the city.
地铁通常比在城市里开车快。
3. You can buy a metro ticket at the station.
你可以在车站买地铁票。