Definition
This idiom is used to express that a kind or helpful act should be reciprocated, especially towards someone who has previously done something beneficial.
以德報德
Since John lent me his car when I needed it, I should definitely help him move when he needs it; one good turn deserves another.
既然約翰在我需要的時候借車給我，我當然應該在他需要搬家時幫助他；好心有好報。
My colleagues always offer help when I need extra hands, so when they asked for help with their presentation, I did it without hesitation. One good turn deserves another.
我的同事們總是在我需要額外幫助時伸出援手，所以當他們需要幫忙準備簡報時，我毫不猶豫地答應了。好心有好報。
I once assisted her in getting a promotion at work, so she was happy to support my new project. One good turn deserves another.
我曾幫助她在工作上獲得晉升，所以她很樂意支持我的新專案。好心有好報。