时间:2019-01-23 作者:英语课 分类:探索与发现2013年


英语课

 Picture a living plane, and that gives you a sense of what Quetzalcoatlus would look like in life.


 
And this is an animal that probably accelerates over 2.5G’s just on takeoff.
 
Just beyond our comprehension.
 
A Quetzalcoatlus is 10 times the weight of the largest flying bird today. Yet this airborne reptile 1 doesn’t rely on feathers. Its wings are made of skin. Almost half of that wing is supported by an extended finger bone, a finger 2.5 meters long. A second bone lines the front of the wing, forming a leading edge, similar to an aircraft. 
 
This aerodynamic design allows for near-perfect control on takeoff and landing. But for this flying monster, getting off the ground is the hardest task. 
 
Big pterosaur like Quetzalcoatlus giraffe height on all fours, and it’s got to get up into the air. How is it gonna do that?
 
And that’s made it more difficult living on the plains of Texas. 
 
Flat ground, no hills, no cliffs, no special conditions, nothing to help it at all except its muscles. It could still take off from a standstill without any running required.
 
The secret to how this Goliath takes off can be seen in a creature 1,000 times smaller, the vampire 2 bat.
 
They have to spring up into the air. They have to do essentially 3 a super push-up with their powerful forelimbs, the strongest limbs they have, get up high enough so that they can get their wings to flap and get off the ground.
 
A Quetzalcoatlus takes off in the same way, using all four limbs to suddenly leap up into the air. Its powerful arm muscles are composed of 80% fast-twitch fiber 4, a third more than humans. This specialized 5 muscle tissue is capable of delivering rapid bursts of energy. This energy is needed to propel this creature weighing as much as a grizzly bear, from a dead stop to a launch speed of 50 kilometers…

n.爬行动物;两栖动物
  • The frog is not a true reptile.青蛙并非真正的爬行动物。
  • So you should not be surprised to see someone keep a reptile as a pet.所以,你不必惊奇有人养了一只爬行动物作为宠物。
n.吸血鬼
  • It wasn't a wife waiting there for him but a blood sucking vampire!家里的不是个老婆,而是个吸人血的妖精!
  • Children were afraid to go to sleep at night because of the many legends of vampire.由于听过许多有关吸血鬼的传说,孩子们晚上不敢去睡觉。
adv.本质上,实质上,基本上
  • Really great men are essentially modest.真正的伟人大都很谦虚。
  • She is an essentially selfish person.她本质上是个自私自利的人。
n.纤维,纤维质
  • The basic structural unit of yarn is the fiber.纤维是纱的基本结构单元。
  • The material must be free of fiber clumps.这种材料必须无纤维块。
adj.专门的,专业化的
  • 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。
学英语单词
abegweit
Aisega
aluminium ethide
anti-glare panel
Atkri
ballymenas
blumeria graminis
braa
Calogreen
Calvignac
candy-coated
celie
cellular mobile telephone
ceorls
cetocytic
chevron stripe
coli-aerogenes group
collar stud
Committed Facility
compounding of tectonic systems
constant level lubrication
contour spinning
convergence of corner
craters of the moon national monument
current ratio relay
dadum
database for natural language
direct refrigerant
drilling and blasting method
Esmeralda bella
ethyl polyethylene-oxide
eupyrene sperm
farawayness
fifty percent rule
final page
fluoride film
FSTDNA
gnvq intermediate
graphite blacking
gravel spreader
gun hoist
hardwood board
hierococcyx sparverioides sparverioides
high style
immunised cotton
inertia region
Issaba
Lakasjö
light distribution
long-shave machine
main drive gear bearing retainer
meadow leeks
medium dead
Mexitilen
midwive
missed labour
multi-tools
narrow-spectrum antibiotic
null gate
olive-backed oriole
olly olly oxen free
paleoanthropology
paper-tape speed
pentaerythrite tertranitrate
Phoenician alphabet
powdered opium
prefill valve
ptarmus
pumped storage index
punched tape machine
pyrovanadate
rajma
red pepper
regular pitch chain
relative log
respectablize
Saussurea limprichtii
save energy mode
semi-logarithmic chart
set section
shils
SIM-C
site quality of forest
sootball
sound navigation and ranging(sonar)
Spondli's foramen
squire-like
stages of screwdrill
subumbilical space
Swan Hills
swaps out
synergic reflex
taunted
textured yarns
timber connector
trailererector
ventral lobe
war party
Western Electric
wfdd
yo-hah
zona septomarginalis