Well, it's pretty obvious to do as a human, but let's come up with a simple heuristic.
对于我们来说这是显而易见的,但现在我们,提出一种简单的试探法。
And one thing that Einstein put forth is he figured if well, what we're saying is that light is, in fact, a stream of particles, each one of those particles or photons must, therefore, have a momentum.
爱因斯坦提出了一件事情,他指出如果我们所说的光,事实上是一束粒子,那么这些粒子或者光子中的,每一个都有动量。
It starts by raising a certain philosophical objection to the personality theory.
首先我们对人格理论提出一种哲学上的异议。
So here's the question we started the class off with.
现在回到我们一开课提出的那个问题。
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