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to improve the environment
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When my grandparents were young, they lived a hard life. They didn't have enough
food to eat or comfortable houses to live in. It was not easy to travel around because
they had to walk or ride a bike. But at that time, the air was fresh and they could swim
and catch fish in the clean river. At present, people's life is much better. They have all
kinds of food to eat and have moved into flats in tall buildings. They can travel around
by car, by bus, by train or by air. But the environment is not as clean as before.
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