"I will give you one wish each," the angel says.
“我将给你们每个人一个愿望。”天使说。
If I had the power to make one wish for you, I would find it very hard to decide what gift to give-what gift would help you to happiness.
如果我可以为你许一个愿，我发现很难决定给你一件什么礼物———一件有助于你幸福的礼物。
You give as input the present state, and the laws return as output what the state will be one instant later (or earlier, if we wish).
你输入了现在的状态，定律就输出一个结果，显示出稍后不久（或者依照我们所想知道的，此前不久）是什么状态。
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