很可能未来会发明出更多辅助视觉的工具，它们超越现有仪器的程度，就像现有仪器超越肉眼一样。
It is not unlikely, but that there may be yet invented several other helps for the eye, as much exceeding those already found, as those do the bare eye.
There are only two things in life that are busy living and dying.