当然，人类与树木也是共生的。树木吸收人类生活及其机器生产所产生出来的二氧化碳气体，并且把转化成必需的氧气。

Of course, humans live in symbiosis with trees too: trees take in the carbon dioxide people and their machines make and turn it into needed oxygen.

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我们拿相对无害的药品，把它们转化成毒药。

We're taking relatively benign medicines and we're turning them into poisons.

《柯林斯英汉双解大词典》

它们把糖转化成酸，酸会腐蚀较硬的牙齿外层。

They change sugar into acids, which break down the tooth's harder outer covering.

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Another thing we can do, a very important thing, is we can think about changing the game into a game of repeated interaction and seeing how much that helps, and we'll come back and revisit that later in the class.

另一个重要的东西是,我们可以考虑把单次博弈转化成,重复博弈,然后看看是否有效,我们以后再来学习这部分内容

耶鲁公开课 - 博弈论课程节选