translation.en: So, recently, we have realized that the ordinary matter in the universe -- and by ordinary matter, I mean you, me, the planets, the stars, the galaxies -- the ordinary matter makes up only a few percent of the content of the universe.
translation.zh: 最近，我们意识到 宇宙中的普通物质--- 我指的普通物质，我的意思是你，我 行星，横星，银河系--- 普通物质仅仅占据 宇宙组成的一小部分。