感谢每天给我点赞的小伙伴们，感谢你们对我的鼓励和支持，咱们一起学起来。同时也可以留言，互相交流。

18'

In the good old days before computers, people read printed books and newspapers to get information. Students spent hours and hours in the library, looking for information in dusty old books for class assignments. Now information is instant! 
敲黑板
good old days 曾经的美好时光