相关单词近義詞 fellowship 友誼, mutual benefit 互惠互利, mutuality 相互關系, exchange 交換, trade 貿易, trade-off (對不能同時兼顧的因素)..., interchange 交換, switch 轉換, reciprocality reciprocal的名...臨近詞REC, recopy 返回 reciprocities