Courtesy calls for reciprocity
陈词滥调老生常谈 cut and dried, 男士必需保藏:男士健身计划, 波胆比分, cliché 投桃报李 Courtesy calls for reciprocity. 留得青山正在不怕出柴烧 Where there is life, there is hope. .
Exchange gifts between friends
... exchange sth as gifts 交换某物作为礼物 Exchange gifts between friends 投桃报李 to exchange gifts 互赠礼物 ...
to exchange gifts
... 鼠李糖 rhamnose 投桃报李 to exchange gifts 新莱昂州 nuevo leon ...
log rolling
这种现象在美国已被称为投桃报李(Log rolling)。这种投桃报李式的合谋往往使公共决策超出其合理范围而延伸到可以留给私人选择的领域中去。
reciprocity or gift-exchange models
"投桃报李"是个多义词,它可以指投桃报李(成语),投桃报李(新闻漫画)。