Someone or something that is sentimental feels or shows pity or love, sometimes to an extent that is considered exaggerated and foolish.
I'm trying not to be sentimental about the past.
我尽力不为过去的事情而多愁善感。
Sentimental means relating to or involving feelings such as pity or love, especially for things in the past.
Our paintings and photographs are of sentimental value only.
我们的画和照片只有纪念价值。