In the center, your fovea clearly identifies 3 to 4 letters around where your eyes stop.

在中央，中央凹清楚地识别出眼睛停下来地方周围 3 到 4 字母。

Since the fovea is pretty small, your eyes read text by making quick jerky movements called saccades.

由于中央窝很小，眼睛就会通过快速跳作来阅读文本，作被称为扫视。

And you have only one fovea.

而中央凹只有一。

In the center, your fovea clearly  identifies 3 to 4 letters around where your eyes stop.

在中, 中央凹清楚地识别出3到4字母, 眼睛停在那里。

It's approximately 5 millimeters in diameter and houses another even more specialized region known as the fovea.

它直径约为5毫米，其中包含另一更为特殊区域，称为中央凹。

They probably didn't have any conception of peripheral vision or the fovea or, I mean, basically anything.

他们可能根本没有关于周边视觉或黄斑概念，我说是基本上任何概念都没有。

Raptors have an especially deep fovea— a depression in the back of their eye that fits more photoreceptors.

猛禽有一特别深中央凹— —它们眼睛后部凹陷处适合更多光感受器。

And the fovea is the very center of the retina, about a quarter of a millimeter wide.

中央凹是视网膜中， 大约四分之一毫米宽。

The fovea is the area in the center of your vision where the photoreceptors are most densely packed, and where your vision is the sharpest.

中央凹是视觉中区域，那里光感受器密度最高，视觉最清晰。

The fovea is the area in the center of your vision  where the photoreceptors are most densely packed, and where your vision is the sharpest.

中凹是您视力中区域, 感光细胞最密集, 您视力最敏锐。

Of these, only the fovea has a high enough density of cones, the type of photoreceptor cell in your eye that can perceive small details, to make out text on a page.

其中，只有中央窝视锥细胞密度足够高，视锥细胞是一种视觉感受器细胞，可以感知小细节，从而辨认出一页纸上文字。