The researchers also found that Shuvuuia had a very wide scleral ring -- tiny bones that circle the eyeball.

研究人员还发现鸟面龙有非常宽环——环绕眼球微小骨骼。

Recycling of that heme group yields unconjugated bilirubin, which at high concentration can cause scleral icterus, jaundice, and bilirubin gall stones.

亚铁血红素循环利用会产生非结合胆红素，其浓度过会导致黄染、黄疸与胆红素胆结石。

In 2010, a group of researchers looked at a sample of eye bones, called scleral rings.

2010 年，一组研究人员观察了眼骨样本，称环。

And along with the scleral rings, researchers have unearthed more fossil evidence that dinosaurs weren't entirely limited to daytime hours.

除了环，研究人员还发掘了更多化石证据，证明恐龙并不完全局限于白天。

Now, some dinosaurs also had scleral rings, and when they applied that same approach to 23 dinosaur fossils in 2011, the researchers found that plenty of them were most likely active at night—including hunters like Velociraptor.

现在，一些恐龙也有环，当他们在 2011 年对 23 种恐龙化石采用同样方法时， 研究人员发现其中很多恐龙很可能在夜间活动——包括像迅猛龙这样猎手。