the most important development in your country in the past 20 years

The development of high speed trains makes life much more convenientin China.
　　First of all, they are much faster than the past. It used to takea lot of time to travel from one city to another. According to my father, it took about twenty hours to travel from Shanghai to Beijing by train. But since we have the new high speed trains, it just takes about 5 hours for the same distance.
　　What’s more, many more cities have access to trains. For example, In the past you couldn’tgo to Lhasa, the capital of Tibet（同位语）,by train since it did not have a train station. But now, you can pay a visit to Lhasa by train.

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