So this whole world, the nano world, this area in here is called the nano world, and the nano world, the whole micro world that we see, there's a nano world that is wrapped up within that, and the whole -- and that is the world of molecules and atoms.
这一切，这个纳米世界, 以上 被称为纳米世界 在整个看得见的微观世界里面 还藏着这样一个纳米世界 这是分子和原子的世界