对我们这些三色视者而言，很难想象四色的世界什么样子的。
It may be impossible for us trichromats to imagine what a four-color world would look like.
四色视者具有某一种介于红色和绿色锥体(橙色范围的某处)和100个阴影处，这能够让女人看清楚1亿种颜色。
A tetrachromat has another type of cone in between the red and green (somewhere in the orange range) and its 100 shades, theoretically, would allow a woman to see 100 million different colors.
通过基因筛选找到四色视者是一回事，证明她们可以看到千万种更多的色彩则是另一回事。
Finding tetrachromats through genetic screening is one thing. Proving they can see tens of millions of additional colors is another.
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