The reason that you can see me standing here is because this room is filled with more than 100 quintillion photons, and they're moving randomly through the space, near the speed of light.
大家之所以能看见我站在台上 是因为这个房间充满了超过一万亿亿光子。 它们正在这个空间里以接近光的速度随机运动。