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肥皂可谓是生活必需品,几乎每个人的生活都离不开它.那么,肥皂是如何被人们发现的?它又是怎样被人们广泛应用于日常生活中的呢?你知道如何制备肥皂吗?
Soap can be described as a necessity, almost everyone’s life can not be separated from it.So how soap was found and how it is widely used in everyday life? Do you know how to make soap?