两个观察员看到了一束光的爆发:他们一个静止在平台上,还有一个在火车上移动。
A burst of light is seen by two observers: one stationary on a platform, the other moving in a train.
就像集中焦点的一束光那样思考。
That's like using the mind like a concentrated beam of light.
一束光从摆放的静物身上依次扫过。
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。
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