For quarrels, they are with care and discretion to be avoided. They are commonly for mistresses, healths, place, and words.

理应小心谨慎，避免争吵：通常因情人、祝寿、名次、言语而引起争吵。

youdao

You also hire the mistresses of Oxford High School for girls.

你也为女孩们雇佣了牛津高中的女教师。

youdao

Wives are young men's mistresses; companions for middle ages and old men's nurses. ----Bacon.

妻子是年轻人的女方情人；中年人的伴侣；老年人的看护。 ----培根。

youdao

Since Priscila Leite and Isabella Velletri set up Homestaff, a domestic-employment agency, three years ago, they have been contacted by 5, 000 would-be mistresses and have been able to find staff for 650.

ECONOMIST: Domestic labour

By the late 1800s the Royal Yacht Squadron had become a social nexus abuzz with the beautiful mistresses of King Edward VII and with American heiresses on the prowl for British aristos.

FORBES: Old Gaffers

But Mr Ozawa's fortunes fell this week when it emerged that his wife had written to his closest supporters about his two mistresses and his illegitimate child but, more crucially, had berated her husband for taking months to visit the disaster-affected areas of Iwate, his home prefecture.

ECONOMIST: The prime minister has most foes on his own side