[mass noun]the practice of exchanging things with others for mutual benefit, especially privileges granted by one country or organization to another (尤指国家、组织之间在利益上、特权上的)互给;互换;互惠;对等
语源
mid 18th cent.: from French réciprocité, from réciproque, from Latin reciprocus 'moving backwards and forwards' (see reciprocate)