时间:2019-01-22 作者:英语课 分类:英语时差8,16


英语课

 Last time we discussed how human beings are the only primate 1 that walks on two feet.   One theory for how this might have happened says that, when our species was just getting its start, reaching up for fruit was a good thing to be able to do. Those who could temporarily rear up on two feet could get more food, and thus had a survival advantage over those who couldn't. In time, those who could stand on two feet indefinitely beat out those who could only do it temporarily. In time you have the modern, free-standing 2 human form.


But you may have noticed that human beings are good at doing a lot of other things than just picking fruit. These days we can stroll around on two feet at will. Our hands are free to do all sorts of things, from building space stations to building radio stations. Our brains have grown much larger than they were when we lived in trees. We have become a radically 3 different kind of creature.
If you can get a sense of how this has happened, you will have understood something wonderful about evolution. First comes the competition over fruit. The animal that stands the best survives and reproduces, passing on its characteristics. But now you have a lot of standing animals. A standing animal can see predators 4 from farther away, another survival advantage. Standing also means your forelimbs can be used to manipulate objects and create tools. One thing leads to another and another and another. Across millions of years, a little thing like grabbing fruit can trigger an entire change of species.

n.灵长类(目)动物,首席主教;adj.首要的
  • 14 percent of primate species are highly endangered.14%的灵长类物种处于高度濒危状态。
  • The woolly spider monkey is the largest primate in the Americas.绒毛蛛猴是美洲最大的灵长类动物。
n.持续,地位;adj.永久的,不动的,直立的,不流动的
  • After the earthquake only a few houses were left standing.地震过后只有几幢房屋还立着。
  • They're standing out against any change in the law.他们坚决反对对法律做任何修改。
ad.根本地,本质地
  • I think we may have to rethink our policies fairly radically. 我认为我们可能要对我们的政策进行根本的反思。
  • The health service must be radically reformed. 公共医疗卫生服务必须进行彻底改革。
n.食肉动物( predator的名词复数 );奴役他人者(尤指在财务或性关系方面)
  • birds and their earthbound predators 鸟和地面上捕食它们的动物
  • The eyes of predators are highly sensitive to the slightest movement. 捕食性动物的眼睛能感觉到最细小的动静。 来自《简明英汉词典》
学英语单词
absolute zero temperature
addition of failure rates
Aldreth
anorexy
arsonous
arthonia tumidula
backstep welding
basic subroutine reference
bearded seal
Bible-clerk
Bifrost
biochemical degradation
Birch Hills
black clip
bleaching agent I for wool
boom cut
buried wire
businesses-to-businesses
Caltra
carvan
catechol-oxydase
char combustion
cluster fly
communifaking
constant value conrol
cordyceps sinensis (berk) sacc
depaves
divisibleness
Djerba, I.de
exophthalmos-producing
external definition symbol
frankl
frequency response testing
gelled patterning and gilding
hazeless
hexamethyl
hole semi-conductor
human T-cell leukemia virus
hump day
iatrogenic impotence
inclination angle of an orbit
information processing systems
internal beam current
kernel of multi-microprocessor operating system
Kira-gawa
latern (ring)
liquid-saturation curve
long keeping
luster of wood
mailbox name
malleable cast-iron
manganese(iv) hydroxide
mareogram
mask pitch
mesh division
metellis
Middenmeer
mucilago tragacanthae
myeloparalysis
Newaygo County
not know if one is coming or going
nuristans
osyter bed
Pacahuaras, R.
paganised
palette(s)
panentheist
pantomycin
peck and hale
photoefficiency of photocathode
photreceptors
piosity
preamble clause
prioritisings
Purnea
relative growth method
repeating circle
retromandibular
scroll bone
second level interrupt
securities market line
separate body and frame
simke
Sinnamary
spectrohelioscope
squamose structure
St Andrews's cross
starded
sulcus infrapalpebralis
tatkal
team project
tetrachordos
tige
unloaded spring
unsightliest
urodelian
Valdemembra, R.
vehicle actuated signal
wature
wihtig
wild purslanes
with a yawn