他突然感到一丝悔意。用英语怎么说？

他突然感到一丝悔意。

He felt a flicker of regret...

he

pron. 他，它，一个人；n. 雄性动物；

例句
Logic had prevailed and he had abandoned the idea.
最终理智占了上风，他打消了那个念头。

felt

n. 毛毡；v. 摸索( feel的过去式和过去分词 )，触，深感，以为；

例句
She felt as if his words had granted her absolution.
她感觉他的那番话好似给她下了道赦令。

flicker

v. 闪烁，飘扬，摆动，昏倒；n. 闪烁，闪光，电影，假装昏倒的乞丐；

例句
She put the letter on the desk in front of me, her face deadpan, not a flicker of a smile.
她把那封信放在我面前的桌子上，故意一脸严肃，没有一丝的笑容。

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

regret

vt. 后悔，悔恨，遗憾，抱歉，悼念，哀

例句
She will regret losing a close political ally.
她将为失去一个亲密的政治盟友而懊悔。