translation.en: So if you think of knowledge being this ever-expanding ripple on a pond, the important thing to realize is that our ignorance, the circumference of this knowledge, also grows with knowledge.
translation.zh: 科学研究就象是池塘里那不断扩展的一圈圈涟漪一样。 重要的是我们要意识到我们的无知和 知识的边界，是和我们所掌握的知识同时增长的。