au pair
/ˌəʊˈpeə(r)/noun
- a young foreign person, typically a woman, who helps with housework or childcare in exchange for food, a room, and some pocket money互惠换工者（以协助家务、照顾孩子等换取食宿和零用钱的外国年轻人, 尤指女性）。
词源
late 19th cent.: from French， literally 'on equal terms'. The phrase was originally adjectival， describing an arrangement between two parties paid for by the exchange of mutual services; the noun usage dates from the 1960s.