dau·phin /ˈdɔfən, ˈdo; ˌdoˈfæn/
法國皇太子
Dau·phin n. The title of the eldest son of the king of France, and heir to the crown. Since the revolution of 1830, the title has been discontinued.
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dauphin
n : formerly, the eldest son of the King of France and direct
heir to the throne