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.

有人說倫敦的公共交通全世界最貴！真的是這樣嗎？本期節目將向您揭示神秘的倫敦地鐵。當然您還會學到很多非常有用的關于公共交通的英語表達。千萬別錯過。