1. 情妇
A married man's mistress is a woman who is not his wife and with whom he is having a sexual relationship.
mistress的反义词
e.g. She was his mistress for three years...
她曾做过他3年的情妇。
e.g. He has a wife and a mistress.
他有妻子，还有一个情妇。
2. 女教师
A mistress is a female teacher.
e.g. My history mistress was extremely helpful.
教我历史的那位女老师特别乐于助人。
3. 女主人
A servant's mistress is the woman that he or she works for.
e.g. It must be really bad, for her to ignore a summons from her mistress!
她居然不听女主人的使唤，实在是太不像话了！
4. (狗的)女主人
A dog's mistress is the woman or girl who owns it.
e.g. The huge wolfhound danced in circles around his mistress.
这条大狼犬围着女主人蹦蹦跳跳地绕圈子。
5. 绝对控制…的女人；主宰…的女人
If a woman is mistress of a situation, she has complete control over it.
mistress的翻译
e.g. She had always been mistress of her own destiny.
她总是能够掌握自己的命运。
6. (精通某项活动的)女能手，女行家
If you say that a woman is a mistress of a particular activity, you mean that she is very skilled at it.
mistress
e.g. She is a mistress of disguise.
她是伪装的高手。
e.g. ...another winner from the mistress of historical romance.
来自这位历史爱情小说知名女作家又一部必定大受欢迎的作品