She is having an affair with her boss.

她跟老板有暧昧关系。

《牛津词典》

My husband was still seeing her and he was having an affair with her.

当时我丈夫仍与她交往，并跟她有暧昧关系。

《柯林斯英汉双解大词典》

The article insinuated that he was having an affair with his friend's wife.

文章含沙射影地点出他和朋友的妻子有染。

《牛津词典》

"I have made my drawings with the greatest accuracy, and the most minute attention", he wrote."In an affair of so much consequence to the dignity of the United States,"

VOA: special.2010.01.27

"It's really more like a soccer crowd" The month-long Bali Arts Festival is an enormous affair, with multiple stages of music and dance,plus fashion shows, food stalls,and events for children, in addition to the traditional music and dance performances and competitions.

VOA: standard.2010.07.01

John Edwards admitted in August that he had had an affair with Rielle Hunter, then 42.

CNN: Elizabeth Edwards breaks silence on affair

Edwards eventually admitted to having carried on an affair with Hunter and fathering her child.

CNN: SHARE THIS

Ms Trolle had allegedly claimed to him she had been having an affair with Mr Sheridan.

BBC: Tommy Sheridan begins own defence in perjury trial