translation.en: Einstein realized that if space were empty, if the universe were empty, it would be like this picture, except for maybe without the helpful grid drawn on it.
translation.zh: 爱因斯坦意识到如果宇宙是空的， 如果宇宙是空的， 它将看起来像这幅照片一样， 除了那些画在上面的辅助线。