But the worst part is that print version of textbooks are constantly undergoing revisions.
出自-2013年6月阅读原文
英语六级真题
The revisions come at a time when green marketing is on the rise.
出自-2016年6月阅读原文
柯林斯高阶英汉双解学习词典释义
N-VAR
修订;修改;修正;校订
To make a revision of something that is written or something that has been decided means to make changes to it in order to improve it, make it more modern, or make it more suitable for a particular purpose.