One good turn deserves another turn, deserves, One, good

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One good turn deserves another.
　　善有善报/以德报德
　　Turn,在这里做名词，解释为(帮助或损害别人的)举动，行为：do somebody a good (bad) turn.做一件有利(损)于某人的事。除此以外，turn还可以做动词，比如：turn a somersault翻跟斗；turn somebody against another使某人与另一人作对；turn a street corner沿街角拐弯。
　　再来学习几个关于turn的词组：turn upside down，颠倒，弄乱。Don’t turn our arrangements upside down.别把我们的安排搞乱了；Turn on the tears，一下子流起泪来；On the turn，正在转变中；To the turn of a hair丝毫不差地。
　　Deserve, to have earned something by good or bad actions or behavior,应受；值得。Deserve punishment ( a reward )应受处罚(奖赏)；deserve to be mentioned值得一提。