Is it a clock?

Hi! What's this?

It's a Big Ben.

Yes, it is. It's a very old clock.

That's great!

[例句]This river is very wide. But it's very long. (river, wide, long)

Ways to travel

    There are many ways to travel in Shanghai. You can take a bus, the underground and even a maglev train.

    Since 2003, the first line of maglev trains in the world runs there. The train has no wheels. It flies! It can travel 430km per hour. It is much faster than other trains.

underground 地铁    a maglev train 磁悬浮列车    than 比