如果我们把地球当作一个基本单位,那它只对太阳系有意义,对于银河系来说它只是一粒沙子。同理,对于宇宙来说,银河系又是一粒沙子。反过来想,如果一个质子是一个星球,难道一颗沙子不是一个宇宙吗?所以一朵花中也有一个 If we think of the Earth as a basic unit, it only makes sense for the solar system, and for the Milky Way it is just a grain of sand. By the same token, the Milky Way is another piece of sand for the universe. Conversely, if a proton is a planet, is not a sand a universe? So there is also a flower