translation.en: So there could be another universe just a millimeter away from ours, but we're not aware of it because that millimeter is measured in some fourth spatial dimension, and we're imprisoned in our three.
translation.zh: 所以可能存在另一个宇宙，距离我们的只有一毫米远， 但我们却不能感知它，因为那一毫米距离 是某个四维空间维度的尺寸， 而我们被禁锢在我们的三维空间里。