投桃报李的英文
“投桃报李”对应的英文单词有：return presents between friends、return a favor with a favor、exchange gifts between friends ，一共3个，具体意思及用法如下：
return presents between friends投桃报李
return a favor with a favor投桃报李
exchange gifts between friends投桃报李
与投桃报李相关的短语
互惠或投桃报李模型reciprocity or gift-exchange models