It is very convenient to travel in London by underground.
在伦敦游玩时，坐地铁是很方便的。
If you want to avoid traffic jam, you can travel by underground.
如果你想避开交通拥堵的话，你可以乘地铁出行。
Many people live outside the centre of London in the suburbs, and they travel to work by train, bus or underground.
许多人居住在远离市中心的郊区，他们乘坐火车、公车或地铁去上班。
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