时间:2018-12-07 作者:英语课 分类:自然探索


英语课

21 俄勒冈青蛙数量急剧减少的调查分析


DATE=5-11-01
TITLE=ENVIRONMENT REPORT - Oregon Frog Study
BYLINE=Cynthia Kirk


(Start at 59" )This is Bill White with the VOA Special English ENVIRONMENT REPORT.
Scientists have tried for years to understand what is causing (1) frogs to disappear around the world. Since Nineteen-Eighty, at least twenty kinds of frogs have (2) disappeared.  Many explanations have been proposed 1.  They include pollution, infections and (3) unidentified environmental threats.  
Scientists have warned about the possible harm to the environment caused by warming of the Earth. Now researchers say they have evidence that climate change could be a cause of the frog deaths. The findings 2 are the first to link climate change with the decreasing frog population in North America. 
A team of researchers studied frog eggs in small bodies of water in the northwestern American state of Oregon. Joseph Kiesecker led the study in Oregon's northern (4)Cascade Mountains. 
Scientists have known for years that frog eggs in the western states are dying 3 from a fungal infection in water. The latest research suggests that the infection is the result of a complex series of events caused by warming temperatures.  
The scientists believe the frogs' eggs become infected because water levels where the eggs are laid are too low. They say climate change has reduced the amount of rainfall in areas where the frogs lay their eggs.  Lower water levels permit more dangerous (5)ultraviolet 4 light from the sun to reach the eggs. Ultraviolet radiation can cause the eggs to lose their ability to resist deadly fungal infections. 
The researchers had done other experiments in the mountains. In those studies, scientists thought that ultraviolet radiation from the decreasing amount of ozone 5 in the atmosphere was causing the frog deaths. Ozone in the upper atmosphere blocks ultraviolet radiation from the sun. 
Some scientists disagree with the new study. They say the effects of ultraviolet radiation in Oregon probably would not happen anywhere else. They also disagree about whether the (6) fungal infection is the direct cause of the frog deaths. Some scientists say the (7)fungus could have developed in the eggs after they had already died of a different cause. 
Scientists note that not all of the world's frogs lay their eggs in water. They say there are probably many reasons for the decreasing populations of frogs around the world.  
This VOA Special English ENVIRONMENT REPORT was written by Cynthia Kirk.


注释:
(1)  frog[ frC^ ]n.青蛙
(2) disappear[ 7disE5piE ]vi.消失, 不见
(3) unidentified[ 5Qnai5dentifaid ]adj.未经确认的
(4) cascade[ kAs5keid ]n.小瀑布, 喷流vi.成瀑布落下
(5) ultraviolet[ 5QltrE5vaiElit ]adj.紫外线的, 紫外的n.紫外线辐射
(6) fungal[ 5fQN^El ]adj.真菌的
(7) fungus[ 5fQN^Es ]n.菌类, 蘑菇



1 proposed
被提议的
  • There is widespread discontent among the staff at the proposed changes to pay and conditions. 员工对改变工资和工作环境的建议普遍不满。
  • an outcry over the proposed change 对拟议的改革所发出的强烈抗议
2 findings
n.发现物( finding的名词复数 );调查(或研究)的结果;(陪审团的)裁决
  • It behoves us to study these findings carefully. 我们理应认真研究这些发现。
  • Their findings have been widely disseminated . 他们的研究成果已经广为传播。
3 dying
adj.垂死的,临终的
  • He was put in charge of the group by the dying leader.他被临终的领导人任命为集团负责人。
  • She was shown into a small room,where there was a dying man.她被领进了一间小屋子,那里有一个垂死的人。
4 ultraviolet
adj.紫外线的;n.紫外线
  • It's called ultraviolet rays.它被叫做紫外线。
  • The sun's ultraviolet rays are responsible for both tanning and burning.阳光中的紫外线是皮肤晒黑和灼伤的根源。
5 ozone
n.臭氧,新鲜空气
  • The ozone layer is a protective layer around the planet Earth.臭氧层是地球的保护层。
  • The capacity of ozone can adjust according of requirement.臭氧的产量可根据需要或调节。
学英语单词
3-carboxyantipyrine
accident costs
aetosaurs
analytically unramified semilocal ring
angstrom's scale
Ban Pa Daeng
batons sinister
beltway/ Beltway bandit
bilardoes
blind thrust fault
bloody vomit
Bolocephalus saussureoides
Bom Sucesso, Ribeirāo
boundary scan test
clastoderma debaryanum
claw foot
climbing maidenhair fern
color gradients
combat day of supply
consolidated income tax system
constructable
contrail formation
deseasonalizes
DIBOA
Didymocarpus stenocarpus
elephant-hide pahoehoe
emphasis
enterprise registration
entwicklung
epigrammatism
extraordinary disbursement
flopsand
franciso
Gamvik
gardyn
gas-solid reaction
generic flow control
guaiac
gut course
Habenaria humidicola
heavenware
hollow tube
hydrochemicogeography
ince burun
information bandwidth
injection-moulded
Innocent III
intercentral articulation
intermining
ion-exchange process
ionic valve
job classification analyst
Klamath R.
koseki
Kronotskiy Poluostrov
logicizes
lung tumor
machine reel
mathewsons
maximum-modulus theorem
misbefalls
montastrea curta
Naka-umi
on-line aerophotogrammetric triangulation
paraffin oils
phaeo-
plurivalent chromosome
porvoos
pregreasing pump
prewrap
pricing entire product package
pyrotechnic gas generator
radioisotope transmission gage
Rally for the Republic
rami utriculi
schlimazel
Selimiye
semi-strong linear element
sequelitis
sir john rosses
slag-hammer
sodium butylate
St-Jean-du-Gard
standing field
suiboku
temperature hyperbola
terminal switching
thawing water irrigation
theoretical geodesy
throws up
townleys
Tremelleae
trichloro-phenomalic acid
unexploded
United Nations Administrative Tribunal
upper breast
wheedles
with-it
wollard
yellow coneflower
zigzag chain
zoolater