礼尚往来
[词典] Courtesy requires a return of visits received.; As the call, so the echo.; Courtesy demands reciprocity.; deal with sb. as he deals with you; [电影] It's My Turn;
[例句]而且因为我的弟弟对她很好，她觉得对于别人的善意或帮助应作出相应的回报（善有善报，礼尚往来）。
And because my brother had been kind to her, she felt that one good turn deserves another.
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