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(57) / 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(153) / 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(62) / 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(68) / 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(88) / 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(138) / 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(74) / 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(96) / 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(75) / 评论(0) 分类 实用英语

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发表于:2019-02-20 / 阅读(141) / 评论(0) 分类 加州语文教材California Treasures G3
学英语单词
absorption thickness
Achillea alpina
adamantanamtne
Adeste Fideles
admissible overload
aerosol valve
air control
amending statute
Anopheles quadrimaculatus
antimice
autofellated
b-girls
biblists
biological feedback
black squirrels
break-even method
butabon
Centralized Market
coeliaco-mesenteric artery
coelorinchus leptorhinus
come with
defeet
dhu al-hijjahs
dubrovski
duplex horizontal sprayer
environmentally correct
erector analis muscle
Estiva
ethylenethiourea
ever-smoker
Exosphaeroma
fore-hood
foreground collimating mark
fuel-burning area
fusspots
Glyconic, glyconic
ground sea
hangups
hemiblock
hierarchical indexed direct access method
homalocephalus
hydrolysis hydrogenation
in record time
instruments of punishment
intervertebral veins
Jiaoxi Township
Khalyasavey
law-executor
manual of budgetary control
march with
market position
Mascouten
medium-sized plot test
metayage system
Neocomian Stage
neurosecretory thickenings
new-builds
normal form for matrix
nozzle dimensions for level gauge
odourlessly
offering mechanism
ordinary sidelight
pick-harness
pointer type declaration
polymethylmethacrylate moldng material
pseudocoris bleekeri
pull-out time
rami cardiaci
rate identification of metals and alloys
refer to sb. as
reinforced grouted masonry
relucts
resin phase
rewarewa
Ronay
rosellini
RS-44872
run circles around someone
sand shadow
Sawākin
scampered
Skinari, Akra
stochastic control
strata pigmenti bulbi oculi
submarines
symbolic circuit
talizumab
tallac
tear a strip off
tellings-off
temperature detecting device
tense systems
the aviator
the wrong
trinking
Tyrrell County
underground utilities
uptrains
Vacuum Circuit Breakers
vertebrate photoreceptor optics
wood-spell