Last Saturday, Yang Ping went to the supermarket. She wanted to buy something for her sister because that day was her sister's birthday. She walked around the supermarket and saw a very beautiful dress. She thought her sister would like it. The dress cost fifty yuan, but Yang Ping decided to buy it. When her sister got this present, she was very happy.
追问.....不是这种....要知道好处呐....
例如：可以保证质量之类的...
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