1·It can make fine visual distinctions because it is blessed with one million cones per square millimeter in its retina.
它的视网膜上每平方毫米有一百万个视锥细胞，所以它能分辨出很细微的视觉差别。
2·For the purposes of our discussion, the key parts of the eye are the lens, the iris and the retina (where we find the rods and cones).
为了便于讨论，我们来谈谈眼睛的主要部位：晶状体，虹膜和视网膜(在那里我们可以找到视杆细胞和视锥细胞)。
3·The eye has certain nerve cells, called cones, in the retina which can differentiate color.
眼睛里面有某种神经细胞，叫做视锥细胞，是存在于视网膜上的区分颜色的细胞。
4·The protein encoded by the gene helps convert vitamin a into a form used by the retina's light-sensing cells (rods and cones) to make rhodopsin, a pigment that absorbs light.
这个基因的蛋白质编码协助维生素a转换成一种被视网膜感觉细胞(视杆细胞和视锥细胞)用来产生视紫红质的物质，而视紫红质是一种能吸光的色素。
5·Our retinas have specialized cells called rods, which are used for night vision, and cones, which deal with color.
视网膜中有视杆细胞，负责夜视，以及视锥细胞，负责颜色。