This area is covered with light sensitive cells known as cones.

这个区域被称为视锥细胞的感光细胞所覆盖。

Cells sensitive mainly to green light and cells sensitive mainly to ultraviolet light.

主要对绿光敏感的细胞，主要对紫外线敏感的细胞。

Light sensitive cells in our retinas feed signals deep into that brain region, training neurons to sync up with Earth's 24 hour cycle of day and night.

我们视网膜中的感光细胞？将信号输入大脑深处，训练神经元与地球昼夜24小时循环同步。