时间:2019-01-23 作者:英语课 分类:探索与发现2012年


英语课

 The store of pollen 1 paints a picture of the plains of 13,000 years ago, a picture that looks very different from the open prairie grassland 2 of today. 


 
But why did this region look so different back then? The ice sheets to the north, although retreating 13,000 years ago, still dominated the climate here. It was much milder and wetter than today, ideal conditions for woodland to flourish. 
 
This is how much of the northern plains must have looked when the first people arrived. Not open prairies as it is now, but a parkland of trees and grassy 3 meadows. 
 
This is a relic 4 of those times. The Osage orange. Every autumn it produces these enormous fruits, huge numbers of them, more the size of great fruits than mere 5 oranges. 
 
But there’s no animal alive today that's big enough to pick and eat them, so this bump of crop just rots. The Osage orange glory days are long gone. But its harvest was once an annual feast for many ice age animals, including mammoths. Fruit must have been a real treat for these grass eaters.

n.[植]花粉
  • Hummingbirds have discovered that nectar and pollen are very nutritious.蜂鸟发现花蜜和花粉是很有营养的。
  • He developed an allergy to pollen.他对花粉过敏。
n.牧场,草地,草原
  • There is a reach of grassland in the distance.远处是连绵一片的草原。
  • The snowstorm swept the vast expanse of grassland.暴风雪袭击了辽阔的草原。
adj.盖满草的;长满草的
  • They sat and had their lunch on a grassy hillside.他们坐在长满草的山坡上吃午饭。
  • Cattle move freely across the grassy plain.牛群自由自在地走过草原。
n.神圣的遗物,遗迹,纪念物
  • This stone axe is a relic of ancient times.这石斧是古代的遗物。
  • He found himself thinking of the man as a relic from the past.他把这个男人看成是过去时代的人物。
adj.纯粹的;仅仅,只不过
  • That is a mere repetition of what you said before.那不过是重复了你以前讲的话。
  • It's a mere waste of time waiting any longer.再等下去纯粹是浪费时间。
学英语单词
Actinokentia
an shih
Ayan-Yuryakh
balance poising
Bangsamoro
bearded mussels
Bentall operation
bisector
burkett
cholangio-jejunostomy
CNC toolings
combination or conspiracies to monopolize
compartmented air box
consutrode
Coranil
counter-round
cowives
Davenda
DC-operated
difloxacin
digital demultiplexer
disk star
Diurite
Ecatepec
emotional affair
endothelium-independent
enteroidea
equipment engineering
Etaxene
f.i.
factory on dock
flow distributing system
flower children
George, Lake
grandmother cell
Hanjiang
heart puncture
hemochromogen
high-energy rate forming
ill conditioning
indispensableness
inflation target
inpainting
intermediate account
isochronous controller
jack up something
Judson powder
leclercq
loran rate
make an end of
mathematical crystallography
megaton (mt)
melissates
mercer
metropolitan area (ma)
minocil
modified
motorcycle cobination
multidraught machine
musculus corrugator supercilli
natanz
non-productive branch
nourishers
Onnebetsu-dake
paminas
parabolic edge section
perennial canker
Photinia beauverdiana
pilocarpa
polygon grinding machine
Portumna
power on/off button
purge out
recoilless rifles
Robin Hoods
scraa
second sheet
sectional floating drydock
seed implant
shaft draining
sound insulation of the body of a coach
spare train paths
standard track layout at intermediate stations
stigmatometer
string art
strong collinearity
test of marine organism toxicity
Thyssen Blassen metallurgical process
tolerism
Tortricoidea
transverse motion of test table
tricholoma
trimetallic catalyst
turbine control board
ultrared absorption spectrometry
ultrasonic material dispersion
uncolike
unlovingly
weazened
work-houses
yttrium hydrophosphate
zinc-coated nut