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• During 1960s-1970s old people used waterweed to bunch the things they bought in the market.
• It was an environmentally-friendly method.However, some people thought that the use of waterweed was trouble.
• The supermarket suggest to use plastic bags because of the inconvenience of waterweed.
• Nowadays people are more concerned the environment, so they suggest to use recycle bags.
Recycle bags have many advantages.For example , they can be reused time and again.
• Besides, they can hold more things than plastic bags and waterweed.