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红花、绿草、蓝天、白云,五彩缤纷的自然界使人们的生活丰富多彩。然而这一切在色盲者的眼里却是灰蒙蒙的一片。这是为什么呢?
Safflower, green grass, blue sky, white clouds, colorful nature make people rich and colorful life. However, all this in the eyes of color blind people is a gray one. Why is this?