Most of it is that white stuff called the sclera, while the most anterior part is the transparent cornea.

大部分是被称为巩膜的白色物质，而最前面的部分是透明的角膜。

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的巩膜环——环绕眼球的微小骨骼。

In fact, research has shown that our surprisingly white scleras, the area that borders the iris, isn't just an accident.

，研究表明我们那如此洁白的巩膜, 也就是虹膜边境的东西，并非是个巧合。

One interesting byproduct is that humans have relatively large white sclera and nearly black pupils and a dark iris.

一个有趣的副产品是，人类拥有相对较大的白色巩膜、近乎黑色的瞳孔以及深色的虹膜。

It's so important that even dogs have evolved to have larger white sclera and more developed eyebrow muscles in order to show more of their sclera.

正因如此重要，狗甚至进化出了更大的白色巩膜和更发达的眉肌，以便展示更多巩膜。

You don't see such prominent white sclera in any other primates, which means that the importance of nonverbal expressiveness and intent is especially important for human survival.

在其他灵长类动物中， 你看不到如此显著的白色巩膜，这意味着非语言表达和意图的重要性对于人类生存尤为关键。