Underground train systems are extremely important for the people living in big cities like London, New York and Beijing.

In his question Joey asks about the subway. But do you know what Londoners call their underground train system?

Wang Fei and William investigate whether the ticket prices on this train system are expensive. Find out more by listening to this programme.

You will also learn a lot of useful English words and expressions relating to public transport and expressing your opinions.

有人说伦敦的公共交通全世界最贵！真的是这样吗？本期节目将向您揭示神秘的伦敦地铁。当然您还会学到很多非常有用的关于公共交通的英语表达。千万别错过。