quid pro quo
noun [ C usually singular ] formal uk/ˌkwɪd prəʊ ˈkwəʊ/ us/ˌkwɪd proʊ ˈkwoʊ/ quid pro quos
交换物;报酬;交换条件
something that is given to a person in return for something they have done
The government has promised food aid as a quid pro quo for the stopping of violence. 政府许诺以食品援助作为停止暴力活动的交换条件。