translation.en: We called this bird Sinornis. It's a little bit more advanced than Archaeopteryx, and if you go to different layers, you find things that are less advanced than Archaeopteryx, and every grade in between, so that if you find something today, we're usually splitting hairs -- or, more appropriately, feathers -- as to decide whether it's actually a non-avian or an avian.
translation.zh: 我们叫它中国鸟。它比始祖鸟要更高等一些。 如果你分析不同的地层，就会发现 每往下一层，生物就更低等。 所以今天如果你发现了新的化石，我们通常是去分析它的毛发， 或更恰当地说是羽毛 来决定它是否属于鸟类。