我们知道,语言是社会交际的工具,是一个历史范畴,有它的时代性和社会性。那么作为语言要素之一的词汇最为积极活跃,它随着时代的变异和社会的发展经常处在变动之中。这不仅表现在新词的产生和旧词的消灭上,也表现在词义的演变上。例如“字”这个词,它的本义是生孩子,引申为“抚育、抚养”。秦代以前,“字”还没有文字的意义,文字的“字”只称“文”或“书”,不叫做“字”,自秦刻石才开始把“文字”连用。许慎在《说文解字·叙》中说:“盖依类象形,故称为文;其后形声相益,即 We know that language is a tool of social communication, a historical category, and has its own characteristics of times and sociality. Then as one of the language elements of the vocabulary is the most active and active, with the changes of the times and social development are often in change. This is not only reflected in the production of new words and the destruction of old words, but also in the evolution of meaning. For example, the word “word”, its original meaning is to have children, extended to “tending, raising.” Before the Qin Dynasty, “word” did not have the meaning of words. The word “word” was only called “article” or “book”. It was not called “word”. Xu Shen in “Shuowenjiezi Syria” said: "cover according to the class pictographic, it is called the text; followed by phonic phase benefits, that is