He waited for his mistress to respond in kind, but she did not. Without letting go of his hand, she stood staring into the mirror, first at herself, then at him.

他期待情人也对他报以微笑，但她没有，只是拉着他的手，站在那儿盯着镜子，先看自己，然后看他。

youdao

Tracy was his mistress for three years.

特蕾西给他做了3年情妇。

《柯林斯英汉双解大词典》

When Governor Mark Sanford revealed that he had been cheating on his wife, I was surprised to find that some people had sympathy for him on the grounds that he was in love with his mistress.

当州长马克·桑福德透露他一直在欺骗自己的妻子时，我很惊讶竟然还有些人认为他因为爱着他的情人所以产生了怜悯之心。

youdao

They said the hoo-hah over his sacking of his diary secretary, allegedly to create a job for his mistress, was overblown.

ECONOMIST: Ethics man

That could cause embarrassment, for example if a customer who has bought racy gifts for his mistress enters a Burberry store with his wife and is enthusiastically ushered to the skimpy bikinis.

ECONOMIST: High-tech fashion

In Santiago, Neruda designed La Chascona for himself and his mistress, Matilde Urratia, who later became his third wife.

BBC: Chile��s literary and musical past