All of physics is a two-part program.

所有的物理理论都包含两部分
The plan, every time, is to predict the future given the present.

无论何时我们的做法都是根据现状来预测未来
That's what we always do.

我们一直在这么做
When we do that right, we are satisfied.

如果成功了我们会很满意
So the question is,

所以问题在于
"What do you mean by predict the future?

什么叫预测未来
What do you mean by the future?

未来是什么
What do you mean by the present?"

现在又是什么
By "Present," We mean--

我们所说的"现在" 意思是
we will pick some part of the universe we want to study

我们会选取客观世界某一部分来进行研究
and we will ask,

然后我们就会问
"What information do I need to

我们需要什么信息去了解