a reciprocity treaty互惠條約Reciprocity includes more than gifts and favors; it also applies to concessions that people make to one another.互惠不僅僅包括禮物和優待；它對人們之間互相作出的讓步也同樣適用。
英英詞典釋義
Noun
1. a relation of mutual dependence or action or influence
2. mutual exchange of commercial or other privileges