In order not to lose all carbon from the cycle, the inhabitants burned a portion of the inedible dead plant matter rendering it into carbon dioxide and ash.

• 这个盒子其实还不是完全密封的。尽管它确实是气密的，却只能再循环95%25的水。苏联科学家事先在里面存储了一半的食物（肉类和蛋白质）。