And so we decided that what it really is is that it is entirely materially closed -- that is, nothing goes in or out at all, no material -- and energetically open, which is essentially what planet Earth is.
所以我们决定了，最必要的 就是必须完全封闭， 意味着，无进无出，无材料， 以及能量性的开放。 就像地球一样。