词在使用过程中意义逐步发生变化。词义的演变及新义的产生是词汇语义体系在语言内外因素的作用下不断丰富、发展的表现。词义的发展如同词的产生一样,也起因于社会的发展。社会生活的变革,时代的发展,科学技术的进步,人们对客观事物和现象的认识深化,是促使词汇单位意义内容发 The meaning of words in use gradually changes. The evolution of lexical meaning and the emergence of new meaning are the features of lexical semantic system that are continuously enriched and developed under the influence of internal and external factors of language. The development of meaning, like the production of words, also results from the development of society. The changes of social life, the development of the times, the progress of science and technology, and the deepening of people’s understanding of objective things and phenomena are the reasons for the promotion of the meaning of vocabulary units