Examples

那些不好过的日子想起来就心酸。

We feel sad whenever we think of the difficult days in the past.

看着他穷愁的样子，我心酸极了。

I was extremely sad when I saw him poverty-stricken and full of worries.

心酸

他强撑病体挨日子的情景，真令人心酸。

心酸落泪。

However she was not bitter, or depressed or withdrawn.

然而她并没有感到心酸，忧伤或毫无兴趣。