时间:2019-01-08 作者:英语课 分类:Scientific American(八)月


英语课

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute


Declining frog populations are considered an indicator 1 of environmental damage. But new research finds that frogs might be doing even worse than we thought. Because the volunteers who count frogs by their sounds may be overestimating 2.


The North American Amphibian 3 Monitoring Program is the country’s largest frog-counting system. Volunteers listen for frogs, identify the species, and give population estimates. They’ve been doing this for over a decade.


Ted 4 Simons from North Carolina State University and colleagues put recordings 5 of frogs, like this wood frog, in the field to test the volunteers. They call it Ribbit Radio.


Many volunteers ended up with false positives—they named frog species whose calls weren’t being played. So there may be fewer frogs, or less variety, than the surveys suggest. The results appear in the journal Ecology.


Simons is working with the U.S. Geological Survey—in charge of the amphibian monitoring—to account for these false positives, and to better train the volunteers—so they don’t write down “chorus frog”when all there really was were pickerel frogs. Apparently 6, it’s not easy being green, for humans either.


Thanks for the minute. For Scientific American's 60-Second Science, I'm Synthia Graber.

 



n.指标;指示物,指示者;指示器
  • Gold prices are often seen as an indicator of inflation.黃金价格常常被看作是通货膨胀的指标。
  • His left-hand indicator is flashing.他左手边的转向灯正在闪亮。
对(数量)估计过高,对…作过高的评价( overestimate的现在分词 )
  • I think you're overestimating his abilities. 我看你对他的能力评价过高。
  • With hindsight, he was overestimating their desire for peace. 事后看来,他高估了他们对和平的渴望。
n.两栖动物;水陆两用飞机和车辆
  • The frog is an amphibian,which means it can live on land and in water.青蛙属于两栖动物,也就是说它既能生活在陆地上也能生活在水里。
  • Amphibian is an important specie in ecosystem and has profound meaning in the ecotoxicology evaluation.两栖类是生态系统中的重要物种,并且对环境毒理评价有着深远意义。
vt.翻晒,撒,撒开
  • The invaders gut ted the village.侵略者把村中财物洗劫一空。
  • She often teds the corn when it's sunny.天好的时候她就翻晒玉米。
n.记录( recording的名词复数 );录音;录像;唱片
  • a boxed set of original recordings 一套盒装原声录音带
  • old jazz recordings reissued on CD 以激光唱片重新发行的老爵士乐
adv.显然地;表面上,似乎
  • An apparently blind alley leads suddenly into an open space.山穷水尽,豁然开朗。
  • He was apparently much surprised at the news.他对那个消息显然感到十分惊异。
学英语单词
accommodating transaction
agalma black
all weather body
Amborellales
annulment of marriage
atrial premature contraction (apc)
balck gold(maldonite)
bilateral contract
bjorken-feynman scaling
busted
classification index
Columbia Glacier
conveyer volume meter
cook-off
data reuse
depletives
discount chains
Drum Driving
Earn, Loch
ebgs
ebullition chamber
echo amplitude
emipration theory
environmental quality requirement
fertilizer the soil
fetch off
foid-bearing
foot channels
gadlinium
garden for the blind
gas-liquid heat exchanger
geriatric epidemiology
Gordiacea
half-gas firing
hangoverless
heat discharge
hessian fire hose
hydrargyrum ammoniatum
hydrostome
inhibitor of apoptosis protein
keep on the right side of the law
kernel regression estimation
knotted sheepshank
lean best power mixture
lonchura punctulata topela
loop coupling
mail rocket
management workstation
mannosocellulose
marsaline
means of logistic command
mitraspecine
myxosarcomatous
nonfeminine
north-central
orbitesta
overneat
Pereskiopsis
Picea montigena
pidgin English
post doctorate
pressure-difference valve
pulse compression
quantify
quartz sinter
quasim
re-acquire
rear indicator light
reasonally
rhodium bisulfide
robot safety
robust controller
role-culture
roofing putty
sabatoes
sauba ants
simultaneous system of equations
solveig
space partition
square with the world
stever
stock-holding
swamp blueberry
t'u ?rh wu
tabatha
test radius
testiculose
tool-box-door latch
transformer relay
trouble proof
truncus corporis callosi
unit hydrograph
unlashes
urological pathology
vances
variable levy
viburnum formosanum hay.
well-characterized
William Ralph Inge
witness to the accident
woodfin
zivania