元首夫人

例句：

1. 1.The head of state's wife is the first lady of the country.
   国家元首的妻子是该国的第一夫人。
2. 2. During his term as president, she was known as the First Lady of the United States.
   在他担任美国总统期间，她被称为美国第一夫人。
3. 3.Her husband is the President of the United States, and they have two lovely children.
   她的丈夫是美国总统，他们有两个可爱的孩子。