She was the other woman who broke up their marriage.她就是导致他们婚姻破裂的第三者。She hated being the other woman, but what could she do?她不想充当第三者，但她又能怎么办呢？Do you think there's another woman?你认为有第三者吗？There was a man and his wife and a tertium quid.有一对夫妇及一名关系暧昧的第三者。