translation.en: This is a Klein bottle wine bottle, which, although in four dimensions it shouldn't be able to hold any fluid at all, it's perfectly capable of doing so because our universe has only three spatial dimensions.
translation.zh: 这是一个克莱因葡萄酒瓶， 尽管在一个具有四维空间的 瓶子里储存不了任何液体， 但是这个瓶子却完全可以。 因为我们所处的宇宙只有三维。