音标:[ˈekəʊˌsɪstəmz] ;
n. <生>生态系统( ecosystem的复数形式 )
n. a system formed by the interaction of a community of organisms with their physical environment

Broadcast: Jan 16, 2003 Experts say one of the world's most feared, but misunderstood, creatures is under 2) assault by fishermen. A new study of all types of sharks finds that there are fewer of them

发表于:2018-12-08 / 阅读(56) / 评论(0) 分类 VOA2003(上)-科技先知

Report: Ecosystems More Stressed Than Ever When Super Storm Sandy ravaged the U.S. East Coast and inundated New York City in late October, many wondered if such extreme weather events might be linked to climate change, the gradual warming of the plan

发表于:2018-12-08 / 阅读(150) / 评论(0) 分类 VOA标准英语2012年(十二月)

Last week, tens of thousands of gallons of sewage gushed into urban streams in Baltimore, because of leaky pipes and flooding rains. And when that happens, it's not just organic matter and microbes that get flushed into aquatic habitats. It's drug re

发表于:2018-12-24 / 阅读(60) / 评论(0) 分类 2016年Scientific American(八)月

From NPR News in Washington, I'm Lakshmi Singh. A radical Sunni Muslim cleric born in the US is urging religious scholars to promote holy war against American and Israeli interests in the Middle East. NPR's Soraya Sarhaddi Nelson is in Cairo and repo

发表于:2019-01-08 / 阅读(67) / 评论(0) 分类 2010年NPR美国国家公共电台11月

Lonely bug NB: This is not an accurate word-for-word transcript Dima:Hello and welcome to this edition of 6 Minute English with me, Dima Kostenko Rebecca: and me, Rebecca Byrne. Dima:Today we'll have some useful words and phrases used in science and

发表于:2019-01-10 / 阅读(85) / 评论(0) 分类 六分钟英语

Severe Drought, Wildfires Threaten Water Resources This is Valles Caldera. Actually, it's the giant mouth of a dormant super volcano that last erupted 40,000 years ago. In the millennia since then, the terrain developed high-elevation forests, of abu

发表于:2019-01-13 / 阅读(136) / 评论(0) 分类 VOA标准英语2012年(一月)

AGRICULTURE REPORT - Study Warns of Risk to Seafood Supplies in World's OceansBy Jerilyn Watson Broadcast: Tuesday, November 14, 2006 This is the VOA Special English Agriculture Report. A study has wa

发表于:2019-01-30 / 阅读(71) / 评论(0) 分类 2006年慢速英语(十一)月

Topic: In some countries, parents expect children to spend long time studying both in and after school, and have less free time. Task: (You may spend 40 minutes on this task, and write a minimum of 250 words) Do you think it has the positive or negat

发表于:2019-02-09 / 阅读(93) / 评论(0) 分类 雅思英语

SECTION 1 Time - 30 minutes 38 Questions Directions: Each sentence below has one or two blanks, each blank indicating that something has been omitted. Beneath the sentence are five lettered words or s

发表于:2019-02-13 / 阅读(73) / 评论(0) 分类 实用英语

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发表于:2019-02-20 / 阅读(136) / 评论(0) 分类 加州语文教材California Treasures G3
学英语单词
abjoule
aescine
airs cryogenic aerosol processor
ala of central lobule
amangkurat
ambulator
anomala loi
arietate
auger electron emission
becking
bendalloy
blunders into
bullbeggar
chain data address
CIE-C
committed effective dose equivalent
critical layer
cross colour
cylindrical chart
debit system
diffusion theory approximation
dunno.
end control
excelsior wrapper
falkow
flat tin
flower-piece
geake
Gemmatimonadetes
GM_nouns-and-prepositions
gymnosperm
hemalyke
heteroheptamers
hitchment
hoyt
indecent assault
intrasite communications
joachann
know how many beans make five
Koninckophyllum
kordell
La Trobe R.
Lauesymmetry
liquid mirror telescope
Lynenol
Marburg hemorrhagic fever
martyrs
masking tape
mating rate of virgin female meths
MCL level
meerbeke
mesodermic
minsk mazowiecki
mitochondrional
monargentic
Montreal River
municipally-owned
n.t.
operating hazard analysis
organorubidium
overall external dimension
paper wasp
pcoes
PCSA
pectinid
Pelham, Henry
physically impaired
picture demodulator
polianthes tuberosas
polycotyleden
pubococcygeal
quashed
radial-thrust force
reception facilities
recyclists
resource data subsystem
robert capa
sadi carnots
septate fiber tracheid
single-bed converter
soap bubble
Southeyville
spermatio-
spinal vein
sporidesmium magnibrachypus
squatting speed
St-Antonin
state contables
strainer vines
straw pick-up loader
subheads
suppressed output
surface-grinding
tatoin
time-line
transfer survey inmining district
troostites
V. I.
ventora
water line corrosion
Who are you wating for
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