首页
登录
职称英语
Mighty Flighty A fly can do one thing extremely well:
Mighty Flighty A fly can do one thing extremely well:
游客
2023-10-15
46
管理
问题
Mighty Flighty
A fly can do one thing extremely well: fly. (86)
Recently a team of British scientists declared that the common housefly is the most talented aerodynamicist on the planet, superior to any bird, bat, or bee.
A housefly can make six turns a second; hover; fly straight up, down, or backward; do somersaults; land on the ceiling; and perform various other show-off maneuvers. And it has a brain smaller than a sesame seed.
Michael Dickinson, who studies fly flight in his lib at Cahech, says the housefly isn’t actually the best flier. ’Hoverflies are the be-all and end-all,’ he says. (87)
They can hover in one spot, hurtle through the air to another location, and then race back to their original hovering point precisely.
Scientists, engineers, and military researchers want to know how creatures with such small brains can do that. Maybe they could reverse-engineer a fly to make a robotic device that could reconnoiter dangerous places, such as earthquake zones or collapsed mines.
Dickinson’s laboratory works with fruit flies. Researchers put them in chambers and manipulate the visual field, filming the flies in super-slow motion, 6,000 frames a second. Dickinson is interested in knowing how flies avoid collisions. He has found that certain patterns, such as 90-degree turns, are triggered by visual cues and two equilibrium organs on their backs that function like a gyroseope.
Flies have only a dozen muscles for maneuvering, but they’re loaded with sensors. In addition to their compound eyes, which permit panoramic imagery and are excellent at detecting motion, they have wind-sensitive hairs and antennae. They also have three light sensors, called ocelli, on the tops of their heads, which tell them which way is up. Roughly two-thirds of a fly’s entire nervous system is devoted to processing visual images. They take all this sensory data and boil it clown to a few basic commands, such as ’go left’ and ’go right.’
(88)
Imagine if you didn’t utter an opinion until you had read hundreds of books, magazines, newspaper articles, and blogs, and then issued a statement based on a few basic notions. That’s how a fly approaches flying.
Only the fly is a speed reader. The information processing takes a fraction of a second. Researcher Rafal Zbikowski of Cranfield University in Shrivenham, England, calls this mode of operation a ’sensor-rich feedback control paradigm.’
(89)
Given that flies have evolved for hundreds of millions of years (and that they were the first animals to take to the air), we shouldn’t be surprised that they’re such good fliers.
’They just don’t have brains like ours. Studying flies,’ says Dickinson, ’is like traveling to another planet.’ [br]
选项
答案
设想,你不发表任何意见,直到读过了数百本书、杂志、报纸文章和博客后才就一些基本观点发表一篇声明。
解析
(utter an opinion发表意见。notion观点,想法。)
转载请注明原文地址:https://tihaiku.com/zcyy/3099346.html
相关试题推荐
Gaspricesrose4%inApril,a______risebutthesmallestsinceJanuary.A、mighty
Somebacteria______extremelyharmful,but______areregularlyusedinproducingc
Somebacteria______extremelyharmful,but______areregularlyusedinproducingc
MightyFlightyAflycandoonethingextremelywell:
MightyFlightyAflycandoonethingextremelywell:
MightyFlightyAflycandoonethingextremelywell:
MightyFlightyAflycandoonethingextremelywell:
OnlyoutsidetheEarth’satmosphere______toattainextremelyhighvelocities.A
Astronomershavelearnedthatthespectaculartailsofcometsareextremelytenu
Thiskindofvegetableisextremelyexpensiveinwinterbecauseitis______.A、
随机试题
TheyseizedBelgrade,thoughonlyafterhavingencounteredastubborn______.A、p
Thenovelcontainssomemarvelouslyrevealing______ofrurallifeinthe19thcen
TheWaltDisneyCompanylastweekannouncedplanstorestrictjunkfoodcomm
将一幅800×600像素的BMP图像l.bmp转换为JPEG格式的2.jpg,若
A.政府定价B.政府调节价C.政府备案价D.市场调节价E.企业自定价药品的生产企
为了排除体内代谢废物,人每天至少要排尿A.200ml B.400ml C.5
IG541混合气体灭火系统及高压二氧化碳灭火系统采用其充装的灭火剂进行模拟喷气试
中国居民王某是一家公司的员工,其2012年的收入情况如下:(1)为其他单位提供技
设备基础混凝土强度的验收,主要检查验收其( )是否符合设计要求。A.外观观感
女性,45岁,贫血1年。肝肋下刚可触及,脾未触及。血红蛋白60g/L,红细胞2.
最新回复
(
0
)