ant roles in modern society.

　　尽管许多人认为随着经济的高速发展，用自行车的人数会减少，自行车可能会消亡，然而，这几年我收集的一些信息让我相信自行车仍然会继续在现代社会发挥极其重要的作用。

　　27. environmental experts point out that increasing pollution not only causes serious problems such as global warming but also could threaten to end human life on our planet.

　　环境学家指出：持续增加的污染不仅会导致像全球变暖这样严重的问题，而且还将威胁到人类在这个星球的生存。

　　28. using bicycles contributes greatly to people’s physical fitness as well as easing traffic jams.

　　使用自行车有助于人们的身体健康，并极大地缓解了交通阻塞。

　　29. bicycles can’t be compared with other means of transportation like cars and trains for speed and comfort.

　　在速度和舒适度方面，自行车是无法和汽车、火车这样的交通工具相比的。

　　30. from what has been discussed above, we may safely draw the conclusion that advantages of bicycles far outweigh its disadvantages and it will still play essential roles in modern society.

　　通过以上讨论，我们可以得出结论：自行车的优点远大于缺点，并且在现代社会它仍将发挥重要作用。

　　31. there is a

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