下一个圣诞节只需用喷雪碰撞它便成了。
我常叫它完全弹性碰撞,但其实并不需要这样叫。
I will often call it a completely elastic collision, which is really not necessary.
其次,它需要能够避免碰撞。
They take an atom of lead, accelerate it and have it collide with an atom of nickel.
他们选取一个铅原子,将其加速,让它与镍的原子碰撞。
Pressure is when you have one of these hard spheres colliding against the wall.
这是一个小球,它与墙发生碰撞。
For instance, if I have, what is pressure?
它源于小球与容器壁的碰撞?
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