courteous interaction
礼尚往来，来而不往非礼也。
In courteous interaction, one must give as much as one receives.
汉译英翻译词典收录86165条汉英翻译词条，基本涵盖了全部常用中文字词的英语拼写、翻译、音标、读音、用法、例句等，是英语学习的有利工具。