Now, whether we're talking about fuels or energy carriers, or perhaps novel materials for batteries or fuel cells, nature hasn't ever built those perfect materials yet because nature didn't need to.
现在尽管我们经常谈论燃料， 能源载体， 或者是电池或者燃料电池的新材料时 ， 大自然还没提供给我们这么完美的材料， 因为大自然没有这个必要。