n.相互性;相互作用;互惠主义
Courtesy requires reciprocity among neighbors. 乡里之间讲究礼尚往来。
Reciprocity is an ultimate truth of the universe. 相互作用是宇宙的真正的终极原因。
Reciprocity needs more communications from both countries. 互惠互利建立在两国加强沟通的基础上。