translation.en: However, you notice, since empty space gives off radiation, there's actually thermal fluctuations, and it cycles around all the different possible combinations of the degrees of freedom that exist in empty space.
translation.zh: 但你意识到 因为真空区也会有辐射 所以热涨落其实存在着 它以存在于真空区中的 有着各种不同组合的 自由度之间 不断的循环着