The old edition and the new edition of the book used by our undergraduate this year and before have also been issued. Later undergraduates only used the new edition, and the old edition was no longer printed. The teacher said that the knowledge of the old edition should be more systematic (embarrassing), but I think the new edition is easier to learn, and the knowledge of national conditions is updated and more interesting to learn. The content of the old version is too old. Think about it. It was compiled 20 years ago. What can you say? The society is developing, so is the language. For example, what else is there about telegrams in old books? It's no use learning something that people in 2 1 century will never use! As for the teacher's saying that the old version is better, maybe he wants to be lazy and always uses his excuse that he doesn't have to revise and update his lesson preparation book for 10 thousand years! !