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
ac charging
albinotic fundus
analytical instrument
Aristolochia clematitis
aspenization
banking reform
be unable to say boh to a goose
bookspan
by thunder
Bz., bz.
cabotine
Carex rubrobrunnea
cash flow
centrad
chirospasm
circle phasor diagram
cobaltic bromopentammine salt
concrete seborrhea
CYP2E1
dactyoideus
darbyite
deoxyadenylic
depth direction
developing(out) paper
donor doping
dow-jones industrial averages
ecphonema
equatorial rainforest
Equisetum robustum
fast-operating relay
fibrising
field decay
findhorn
folk house
force variables
friction coefficient of brake shoe
full scale drawing
genus tilletias
give the needle
glancers
GNU FDL
grid-cell
ground contact length of track
had the power to
have an appointment for
Header Footer Edit Window
hepatic stimulant
high point of structure
hydrate water
hydraulic cementing material
jews
joint zone
Larousse, Pierre Athanase
life state
lime-hatings
Loiza
long-grain glutinous rice
luteinizing hormone(lh)
Malangbong
manufacture on-order quantity
marginal cells
mean place
misimpresssion
missile fire control computer
modulation-tone factor
Moleculobiology
normal coldest 3-month period
on-pitch
out of the top drawer
planospiral
planulae
porfiromycine
portrait position
privilege
pseudepisematic colors
push button momentary contact switch
quadrifocal
Repair and Maintenance Clause
S.&S.R.
Salix annulifera
self-world
shore environment
silicane
slatted floor
smooth woodsias
sodium novobiocin
spilocosmia kotoshoensis
subject
subject-control
telpak
tertiary dentin
TIC (transfer in channel)
time-constrained communication
tolerogenic
upward continuation integral
va product
water vapour transmission rate
whelen
wishedly
Xanthoarsenite
yagnyas
yellow-brown soil