If you're free, you could turn your old clothes into new ones with just a little change.

如果有空的话，你可以只做一点点改变就能把旧衣服变成新的。

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"Why is it," Jonathan puzzled, "that the hardest thing in the world is to convince a bird that he is free, and that he can prove it for himself if he'd just spend a little time practicing?"

“怎么搞的，”乔纳森觉得纳闷，“世界上最难办的事怎么倒是使一只鸟儿确信他自己是自由的，而且可以亲自加以证明，只要他肯略微花费点时间练习练习？”

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Let's see that a little more explicitly by just calculating out the free energy change of mixing.

让我们通过计算出，混合物中自由能的变化，使问题更加清楚。

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