At a barrier the particles just pair up with their antiparticle twins, which experience the world in an upside-down, topsy-turvy fashion whereby real-world hills are seen as antiparticle valleys.

• 在位障这一边，粒子与反粒子成对存在。对反粒子而言，世界是颠倒的，真实世界中的山丘对反粒子而言是山谷。