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.
そこで我々は、実際はそれは 物質的に完全に閉じていて どんな物質も出入りせず、かつ エネルギー的には開いた系と定義しました 地球がまさしくそうなのです