60秒科学:提高视力 请多吃鸡的眼睛
吃鸡肉时，你知道鸡身上的哪个部分是最好的吗？科学家的回答是：眼睛。科学发现，鸡的视网膜锥(体) 数量比人类多，因此可以感知更多的色彩。
Super Chicken Vision
Bring home a bucket of fried chicken and you may find that people have strong feelings about which part of the bird is best. Well, scientists at Washington University in St. Louis [led by Joseph Corbo] say the answer is: the eyes. At least when you compare them to our own ocular implements 1. Because chickens can see more colors than we do, findings that appear in the journal Public Library of Science ONE.
The ability to see colors comes from specialized 2 light-sensing cells found in the retina. These cells, called cones 4, come in different flavors, each of which can detect different wavelengths 5 of light. Humans have three kinds of cones that allow us to see red, green and blue. But birds have an extra cone 3 for seeing violet and ultraviolet light.
What’s more, these chicken cones are distributed evenly throughout the retina, enhancing the birds’ ability to see colors all around their visual field.
Woodpeckers, sparrows and pigeons have a similar setup in the retina department, which presumably gives them an advantage when it comes to finding mates or spotting brightly colored berries. It may also explain why the chicken crossed the road. If you could see what he does, maybe you’d head over there, too.
- Primitive man hunted wild animals with crude stone implements. 原始社会的人用粗糙的石器猎取野兽。 来自《现代汉英综合大词典》
- They ordered quantities of farm implements. 他们订购了大量农具。 来自《现代汉英综合大词典》
- There are many specialized agencies in the United Nations.联合国有许多专门机构。
- These tools are very specialized.这些是专用工具。
- Saw-dust piled up in a great cone.锯屑堆积如山。
- The police have sectioned off part of the road with traffic cone.警察用锥形路标把部分路面分隔开来。
- In the pines squirrels commonly chew off and drop entire cones. 松树上的松鼠通常咬掉和弄落整个球果。 来自辞典例句
- Many children would rather eat ice cream from cones than from dishes. 许多小孩喜欢吃蛋卷冰淇淋胜过盘装冰淇淋。 来自辞典例句
- I find him difficult to talk to—we're on completely different wavelengths. 我没法和他谈话，因为我们俩完全不对路。 来自《简明英汉词典》
- Sunlight consists of different wavelengths of radiation. 阳光由几种不同波长的射线组成。 来自辞典例句