当两个目录路径只有一个区别(比如一个单词不同)时，这个是从旧目录切换到新目录的一种简单方法。
It's a simple way of switching from an old directory to a new one when the two directory paths have only one difference, such as a single word.
为了记住旧单词，学习巩固新单词，学生们已经完成了一些相关的作业。
The students have been completing a lot of worksheets to help them remember the old words and learn new words.
为了记住旧单词，学习巩固新单词，学生们已经完成了一些相关的作业。
The students have been completing a lot of worksheets to help them remember the old words and learn new words.
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