单词：look back upon
音标：[luk bæk əˈpɔn] ；
回溯；回忆
look back upon的用法和样例：
例句
- She looked back over a distance of ten years.她回顾过去十年的时间。
- She never looks back to the old days with regret.她从不怀着悔恨的心情回顾过去。