A I suppose that to go by train is cheaper, but I don't have much time.

　　A 我想乘火車更便宜一些，但是我沒有那么多的時間。

　　B Maybe you should go by air. It 'll be much quicker.

　　B 也許你應該乘飛機去。那會快很多。

　　A How long does it take to fly to Shanghai?

　　A 乘飛機到上海需要多長時間？

　　B It's only about an hour.

　　B 大約只需要一個小時。

　　A And there are many flights every day, aren't there?

　　A 每天都有很多次航班嗎？

　　B Yes, but it'll be more expensive than travelling by train.

　　B 是的，但是乘飛機比坐火車要貴得多。

　　Notes 注釋

　　1 If you want to ask how much time something takes, you can say: How long does it take to fly to Shanghai? / How long does it take to fly to Shanghai? ;How long does the opera last? / How long does the opera last?

　　如果你要問做某事需要多長時間，你可以說：How long does it take to fly to Shanghai? / 乘飛機到上海需要多長時間?；How long does the opera last? / 歌劇演出要多長時間?

　　2 Remember, if you only compare two things, use the comparative form: it is much quicker /it is much quicker; It's more expensive than travelling by train. / It's more expensive than travelling by train.

　　記住，如果你想比較兩個事物，用比較級形式：it is much quicker / 快得多; It's more expensive than travelling by train. / 比乘火車要貴得多。

　　Key phrases and sentences
　　重要的短語和句子

　　I suppose that to go by train is cheaper, but I don't have much time.
　　我想乘火車更便宜一些，但是我沒有那么多的時間。

　　Maybe you should go by air.
　　也許你應該乘飛機去。

　　It is much quicker.
　　那會快得多。

　　How long does it take to fly to Shanghai?
　　乘飛機到上海需要多長時間？

　　It's only about an hour.
　　大約只需要一個小時。

　　And there are many flights every day, aren't there?
　　每天都有很多次航班嗎？

　　Yes, but it'll be more expensive than travelling by train.
　　是的，但是乘飛機比坐火車要貴得多。