时间:2019-01-22 作者:英语课 分类:英语时差8,16


英语课

Cats And Colors You can look at that quilt your cat is curled up on and see a patchwork 1 of greens, blues 2, and yellows. Your cat, however, cannot see color variation in the quilt. And here is why. Both humans and cats depend on the back layer of the eye, which is called the retina, to sense light and to distinguish between colors. The retina is made up, in part, of nerve cells that convert color and light into messages they send to the brain. There are two types of cells: rods and cones 3. Rods are very sensitive to light, though they are not used in color vision. Cones on the other hand are not very sensitive to light but can be used in color vision. Because cats have more rods than humans, they use these light-sensitive cells to see in even very dim light. Likewise, because cats have fewer cones than humans, they cannot distinguish between colors the way humans can. But cat eyes do have some cones, and with work cats can learn how to distinguish between colors. In experiments, scientists have taught cats to discriminate 4 between two symbols when the only difference between them is their color. Cats have learned how to make this discrimination, but only when the objects used were very large and the difference between the colors very pronounced. It’s not likely you’ll be able to teach your own cat how to tell the difference between two colors unless you are very patient. Even under controlled laboratory conditions, cats do not learn how to differentiate 5 between two colors until after making over 1,400 attempts. These experiments showed researchers that though cats technically 6 have the ability to tell the difference between two colors, they don’t use that ability in their daily lives.



n.混杂物;拼缝物
  • That proposal is nothing else other than a patchwork.那个建议只是一个大杂烩而已。
  • She patched new cloth to the old coat,so It'seemed mere patchwork. 她把新布初到那件旧上衣上,所以那件衣服看上去就象拼凑起来的东西。
n.抑郁,沮丧;布鲁斯音乐
  • She was in the back of a smoky bar singing the blues.她在烟雾弥漫的酒吧深处唱着布鲁斯歌曲。
  • He was in the blues on account of his failure in business.他因事业失败而意志消沉。
n.(人眼)圆锥细胞;圆锥体( cone的名词复数 );球果;圆锥形东西;(盛冰淇淋的)锥形蛋卷筒
  • 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
v.区别,辨别,区分;有区别地对待
  • You must learn to discriminate between facts and opinions.你必须学会把事实和看法区分出来。
  • They can discriminate hundreds of colours.他们能分辨上百种颜色。
vi.(between)区分;vt.区别;使不同
  • You can differentiate between the houses by the shape of their chimneys.你可以凭借烟囱形状的不同来区分这两幢房子。
  • He never learned to differentiate between good and evil.他从未学会分辨善恶。
adv.专门地,技术上地
  • Technically it is the most advanced equipment ever.从技术上说,这是最先进的设备。
  • The tomato is technically a fruit,although it is eaten as a vegetable.严格地说,西红柿是一种水果,尽管它是当作蔬菜吃的。
学英语单词
abbreviated fascia
acoustical coupling
archegoniatae
articulating process maxilla
arturian
aurantium methylis
automatic sending
avoision
backrow
Baltimore, David
Bayansayr
born-to-be-wild
Brillouin shift
cash production
channel-hopper
charter-school
chloro-carbonic acid
chome
churchtown
college-teacher
comprecant
condenser transducer
condition of assets
copper(ii) tetraborate
dead-wood
density currents
dicephalia
direct business
direct recording system
distillation low temperature
disturbance switching
draw orientation
e-bombs
ecotypically
edit back-up command
elementary flight maneuver
episcopies
erythrocytic capillarys
family canidaes
fault pattern
first stud gear
flooding cock
fried mutton chop with vegetable
frontolysis sector
glacier iceberg
graphitosis
high order bit
homoeomorphic
interstitial-free steel
jeffie
Kafin Karya
long distance
MTPR
narrowband amplifier
naumann symbol
node-pair method
Ochten
Octachloronaphthalene
On a Beach
outstrategized
over commutation
overindustrialized
palytoxins
partitive membrane
patripassianism
perivitelline
pipe set back
premycotic eruptions
principal function
principle of dynamic
push-down operation
put sb out
repairing of vacuum leak
ring stiffness
roof caving
sacchariferous agent
Sagaria
santan
second liquid
set link
set me back
setting amplitude
short duration power frequency voltage withstand test
SO2-4cotransporter-1
stictococcids
strobiluss
suncatcher
sundowner syndrome
Syncalathium qinghaiense
talamantes
talent education method
tectonic syntaxis
temoras
the yellows
theater of war
throw down the gage of battle
tip starch
towgher
tractiver
United Self-Defense Force of Colombia
vigilate
wry nose