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。
基础版：
Bus was an important mode of transportation for Chinese people. In recent years, because the number of private cars has been increasing, the problem of traffic in cities has been more and more serious. To encourage more people to go out by bus, many cities have been trying hard to improve the quality of bus service. The equipment of buses is continually updating, and the speed of buses has been significantly improved too. However, the price of bus tickets is still very low. Nowadays, in many big cities, many local old people can take buses for free.
进阶版：
Bus used to be a main mode of transportation for Chinese people. In recent years, with the mounting number of private cars, the transportation issue in cities is becoming increasingly severe. Many cites have been making their efforts to improve the bus service in order to encourage more people to take buses when going out. The facilities of buses are updating continually. The speed is significantly improved as well. Nevertheless, bus fares are still quite low. Nowadays, local senior citizens in most cities are eligible for free bus rides.
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