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【答案】30 years ago, Shenzhen was a small fishing village. It was very small. There weren't many people. There were not any tunnels. There were not any cars, buses, taxis, trains and plants, either. Now, there are very different from 30 years ago. Shenzhen became a big modern city. There are lots of people. There are a lot of tunnels. There are many cars, buses, taxis, trains and plants, too.
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