求准确翻译,不要网上机器翻译 How man first learned to invent works is unknown.Inother words,the beginning of language is a mystery.All we really know is that man,unlike animals,invented certain sound to express thoughts and feelings,actions and things,so that they could communicate with eath other,and that later they agreed on certain signs,which could be joined together to refer to those sounds,and which could be written down. Those sounds,spoken or written in letters,we call words. The power of words lies in the things they bring up before our minds. Words became filled with meaning for us by experience. The longer we live,the more certain words recall to the glad and sad things of our past,and the more we read and learn,the more the number of words that mean something to us increase.
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