technology
... to reach there by ships. However ,we can only take less than 12 hours to get there now by plane , even sometimes less than 10 hours. The invention of airplane save us a great many of time and speed up our living step. When I was young ,my father told me that Shenzhen was still a small fishing village 30 years ago , at that time , the environment was extreme well . The air is very fresh ,the Shenzhen river is so limpid that we could see some small fishes swimming under the river . Sometimes even many young gays played games and caught fishes ,frogs in the ShenZhen river . In a word , the environment is extremely beautiful and natural ,looked as a heaven . But now , when we walk along the Shenzhen river ,it is easy to find that the water is very dirty and the smell is terrible ,even all the passerby must make a bad face too. Moreover , the air pollution of Shenzhen is awful...