来自《耶鲁大学开放课程：基础物理 第3集 第3集》
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and you attach the one kilogram mass to it.接着你把 1 千克物体固定在上面 -
Yes?请说 -
A wall that will not move?固定的墙吗 -
You're right.你说的没错 -
What can actually happen其实真实的情况就是 -
is that if you're in an enormous laboratory,如果你在一个巨大的实验室里 -
which is made up of an enormous object,这个实验室由巨大的物体组成 -
then you will find that you can,你就会发现能够 -
in fact, attach it to the wall.将它与墙相连 -
You can go in outer space--你能到外太空去 -
No, it won't move very much.是的 它不能跑得太远 -
Once we know enough dynamics,一旦我们了解了足够的动力学知识