当我开始学习的单子，我得到的印象是，他们是神奇的，而且让IO和其他非纯函数纯。
When I started learning about monads, I got the impression that they are magical, and that they somehow make IO and other non-pure functions pure.
当我开始学习的单子，我得到的印象是，他们是神奇的，而且让IO和其他非纯函数纯。
When I started learning about monads, I got the impression that they are magical, and that they somehow make IO and other non-pure functions pure.
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