over和during的区别：

during表示在.....的期間。表示這個過程的時間。

over表示超過的意思。比如說可以用over 代替more than 。

相关介绍

时间介系词over表示超过...时间，有more than的意思。

It must be over three hours since I started working.

从我开始干到现在一定有三个多小时了。

during用来表示一段时间，其意义大致相当于in的用法。一般来说，凡是能用in的地方，也可以用during.例如：He came to see me during my absence.Don’t go to see his wife in his absence.

during强调时间的延续性

They visited many cities during their stay in China