Definition
This idiom is used to express that a helpful or kind act should be repaid with another act of kindness or assistance.
善意的行为应得到回报；以德报德。
I helped you move, so when you need something, I'll be happy to help.
我帮你搬家，所以当你需要什么的时候，我会很乐意帮忙。
Since you lent me your notes last time, I'll help you study this time.
既然你上次借我笔记，这次我会帮你复习。
He took care of my cat last time, so I plan to give him a gift to show my thanks.
他上次照顾我的猫，所以我打算送他一份礼物表示感谢。