reciprocity
n.互惠; 互助; 互换 复数：reciprocities 牛津词典 noun 互惠；互助；互换a situation in which two people, countries, etc. provide the same help or advantages to each other 柯林斯词典 N-UNCOUNT 互惠；互换Reciprocity is the exchange...
阅读更多
n.互惠; 互助; 互换 复数：reciprocities 牛津词典 noun 互惠；互助；互换a situation in which two people, countries, etc. provide the same help or advantages to each other 柯林斯词典 N-UNCOUNT 互惠；互换Reciprocity is the exchange...
阅读更多
