first lady  
noun [ C ] (also First Lady) uk/ˌfɜːst ˈleɪ.di/ us/ˌfɝːst ˈleɪ.di/
  (GOVERNMENT)      
 第一夫人(总统或州长的妻子)
a woman who is married to the political leader of a country or a part of a country
  The former First Lady of the Philippines was known for her vast shoe collection.
 The girls were greeted by the Guatemalan First Lady.
 Compare: first gentleman