地球自转产生昼夜并且速度还很快。
The earth's spins since why we have night and day, and it spins quickly.
由于磁化空腔的效能慢慢降低,那么那些速度还很快的原子就很容易逸出,而其余的气体粒子在不断的碰撞中消耗能量,使得温度降低。
As the height of the magnetic barrier is slowly lowered, the fastest atoms leave the bottle and the remaining gas rethermalizes via elastic atomic collisions at lower and lower temperatures.
The second thing is that this is still not lightening fast.
第二,发光的速度还不是很快。
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