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First Lady

第一夫人 dì​yī​fū​rén
First Lady numeral
the wife of a head of state (especially a president)

The First Lady of the United States plays an important role in many diplomatic situations.

Frequency

Movie subtitles
3.25 per million appears in 1% of films

Sources

Definitions
CC-CEDICT
Frequency data
SUBTLEX-CH