英譯：
One good turn deserves another
例句：
He fixed my bike so I let him use my computer. One good turn deserves another. (他修理我的腳踏車，所以我讓他用我的電腦。投桃報李/禮尚往來嘛!)
One good turn deserves another so we made a great effort to help those people who had helped us in the past. (善有善報! 所以我們盡了最大努力來幫助過去曾經幫助過我們的人)
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