心酸的英文：
feel sad

参考例句：

They girl's pitiful experience would wring one's withers.
这女孩的可怜经历令人心酸。

Entering his crude hut, he felt sad.
走进他那间粗陋的小屋,令人感到心酸。

Kennedy raised him, it was pitiable to see his feeble limbs bend under him
肯尼迪扶起了他，他软弱无力地跪下来，那样子叫人看了真心酸。

"Bold lover, never, never canst thou kiss, Though winning near the goal--yet, do not grieve;"
卤莽的恋人,你永远、永远吻不上,虽然够接近了--但不必心酸

Over the black tide, from an invisible ship, came the sound of a gramophone playing some popular heartrending tune
越过黑乎乎的潮水，从一条望不见的船上传来留声机放出的令人心酸的流行小调。

feel是什么意思：
v. 感觉；认为；有知觉；摸索
n. 感觉，印象

feeling of efficacy
效力感

Has a feeling for language.
对语言有领悟力

You can feel the electricity in the crowd.
你可感到群众的激情。

experience or feel; submit to.
经历或者感觉；使服从。

Savour the feeling of change.
尽情享受改变的滋味。

sad是什么意思：
adj. 悲哀的，难过的；可悲的，令人遗憾的；阴郁的

The general colouring was uniform and sad.
整个色调单调而又阴郁。

After joy comes sadness
乐极生悲

As the evening progressed, sadness turned to rage.
随着夜幕逐渐降临，悲伤变成了愤怒。

He found himself in a sad pickle.
他发现自己已处于困境。

Sadness and gladness succeed each other
悲喜互继,哀乐相续