Do you know Diditaxi? Diditaxi (嘀嘀打车) is a taxi-hailing smart phone app(应用程序) . It is created by Tencent. Now it is getting popular in Xiamen and more than 700 taxi drivers in the city have used the app. The app shows the real-time locations of taxis on a map using the GPS and makes it possible for users to hail (招呼) a taxi on their smart phones. Taxi-hailing apps are also very popular in Beijing, Shanghai, Hangzhou and NanJing and they have tens of thousands of users. The users call a Didicab and pay the drivers by wechat or Alipay. however, the app has been criticized(指责) it is not very good. For example, not all the drivers are good: What if there is a traffic accident(交通事故)?On the other hand, many users think that they are very useful especially during the bad weather and rush hours. Can this app be in use for long: Technology may make a great difference to our life. Let's wait and see.