有人知道“人情债”英文怎么说吗？

a debt of gratitude.

owe other's favor

favor debt

friendship debt

以下是google出来的例句片段：
HCC7 Human Choice and Computers- [ 翻译此页 BETA ]One should refer also to the Rob Kling remembered website where many of his friends wanted to pay him their intellectual and friendship's debt: http://www.slis.indiana.edu/klingremembered/ The Beckman Center of the National Academy of ...

BOOK IV: Canto LV.: Angad's Reply- [ 翻译此页 BETA ]Not honour's law, not friendship's debt, But angry Lakshman's timely threat. No prudent heart will ever place Its trust in one so false and base, Who heeds not friendship, kith or kin, Who scorns the law and cleaves to sin. ...
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