公交车曾是中国人出行的主要交通工具。近年来，由于私家车数量不断增多，城市的交通问题越来越严重。许多城市为了鼓励更多人乘坐公交车出行，一直在努力改善公交车的服务质量。车辆的设施不断更新，车速也有了显著提高。然而，公交车的票价却依然相当低廉。现在，在大多数城市，许多当地老年市民都可以免费乘坐公交车。
      2018年6月四级翻译参考答案：

      Buses used to be the main means of transportation for the Chinese people. In recent years, with the number of private cars increasing, cities have been facing increasingly severe traffic problems. To encourage more people to travel by bus, many cities have been making efforts to improve bus services. Bus facilities have been continuously renovated, and bus speed has also increased dramatically. However, bus fares are still cheap. Now, in most cities, many local elderly citizens can take a bus for free.

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