侵入变质〔作用〕

Researchers Find Bright Side to Some Invasive Species Non-native species present threats to natural environments across the world by pushing out native organisms. Their presence can seriously damage ecosystems that provide clean water, food and other

发表于:2018-12-16 / 阅读(123) / 评论(0) 分类 2018年VOA慢速英语(十)月

Hawaii's Birds Threatened by Invasive Predators, Habitat Loss Many people think of the Hawaiian islands as a Pacific paradise, a string of tropical islands lush with exotic flora and fauna. But the islands' native species - especially birds - have be

发表于:2018-12-16 / 阅读(147) / 评论(0) 分类 VOA标准英语2012年(七月)

Darwin's fabled isles, the Galapagos, are in need of a makeover. And removing invasive species of plants tops the to-do list for the islands restoration. But six species that were set to be exterminated have gotten a reprieve. Because a new study fin

发表于:2018-12-24 / 阅读(157) / 评论(0) 分类 Scientific American(十一)月

We've lost our dog. Luckily he has a tag around his collar and he is also microchipped. It's a smart idea to get your dog microchipped. The microchip is inserted under the skin of the animal. It is done at a veterinarian's office or an animal shelter

发表于:2018-12-28 / 阅读(187) / 评论(0) 分类 中级类英语听力

Invasive species get a bad rapbut we humans are usually to blame for their spread. Take Japanese stiltgrass, an invasive that arrived from Asia nearly 100 years ago as a packing material for porcelain. When it creeps into forests, it forms dense carp

发表于:2019-01-08 / 阅读(139) / 评论(0) 分类 Scientific American(八)月

RACHEL MARTIN, HOST: OK. We're switching gears now over to Berlin, where there is a strange invasion of Louisiana crayfish. The problem reportedly stems from some Berlin residents who bought the fish as pets, only later to dump them in public waters.

发表于:2019-01-11 / 阅读(115) / 评论(0) 分类 2018年NPR美国国家公共电台8月

By Melinda Smith Washington, DC 27 July 2006 watch Surgery report Having surgery used to mean the permanent memento of an ugly scar. But the trend in modern surgery is something called M.I.P., which stands for Minimally Invasive Procedure. There are

发表于:2019-01-12 / 阅读(168) / 评论(0) 分类 2006年VOA标准英语(七月)

Asian Carp now outnumber native fish in many areas of the United States and their expansion particularly threatens the fragile ecosystems of the Great Lakes. In an effort to control algae growth, catfish farmers in the southern United States introduc

发表于:2019-01-13 / 阅读(163) / 评论(0) 分类 VOA标准英语2010年(七)月

Commerical fisherman Chad Isaak and a partner haul in a boatload of invasive Asian Carp, Jul 2010 The multi-billion-dollar commercial fishing industry in the Great Lakes region of the United States employs more than 800,000 people, but is threatened

发表于:2019-01-13 / 阅读(133) / 评论(0) 分类 VOA标准英语2010年(七)月

There's a good reason why people should be concerned about having a healthy environment containing lots of animal and plant species. A new study says the loss of biodiversity may make humans more vulnerable to infectious diseases. Biodiversity is one

发表于:2019-01-13 / 阅读(136) / 评论(0) 分类 VOA标准英语2010年(十二)月

Wasp Recruited to Fight Invasive Beetle 美用黄蜂对抗甲虫入侵 Scientists are pitting insects against insects in a battle to control an invasive species. U.S. Department of Agriculture researchers have released tiny parasitic wasps in forests

发表于:2019-01-14 / 阅读(123) / 评论(0) 分类 VOA标准英语2014年(七月)

ROBERT SIEGEL, HOST: As we've heard, Senator John McCain is recuperating from neurosurgery. He had a blood clot removed from over his eye. And to learn more about the kind of surgery he underwent, its risks and what a recuperation might be like, we t

发表于:2019-01-16 / 阅读(109) / 评论(0) 分类 2017年NPR美国国家公共电台7月

SCOTT DETROW, HOST: Louisiana's shrinking coasts face a new threat. In addition to sinking land, sea level rise and erosion, a tiny bug from the other side of the ocean is killing off marshes. This week the state issued an emergency quarantine. Travi

发表于:2019-01-16 / 阅读(118) / 评论(0) 分类 2018年NPR美国国家公共电台4月

Don: Today, on A Moment of Science, the Ocean's Most Wanted. Sure, they might seem innocent and downright lovely in your aquarium, but released into the wild, your plants and fish can knock aquatic ecosystems right out of balance. Today's invasive sp

发表于:2019-01-22 / 阅读(146) / 评论(0) 分类 英语时差8,16

By Carol Pearson Washington 11 October 2007 One third of the land in the United States belongs to the public. And once a year Americans get a chance to help make these public lands beautiful and healthy for generations to come. VOA's June Soh visited

发表于:2019-01-25 / 阅读(137) / 评论(0) 分类 2007年VOA常速英语(十月)

Lionfish are taking over coral reefs in the Caribbean and Atlantic. Here, Lad Akins catches one. In the waters of the Caribbean Sea, a voracious invasive species called the lionfish is threatening to overtake the reefs. Conservation groups are fighti

发表于:2019-01-31 / 阅读(113) / 评论(0) 分类 VOA标准英语2010年(七)月

By Carol Pearson Washington 18 May 2007 The technology that helps drivers to navigate roads and soldiers to map their positions is now helping doctors repair worn-out knees. The medical procedure is called navigational knee surgery. VOA's Carol Pears

发表于:2019-02-06 / 阅读(221) / 评论(0) 分类 2007年VOA标准英语(五月)

Okay, here it is. 好啦,就是这里啦。 The date is June 24th. 今天是六月二十四号。 I've found what I believe to be a cave. 我猜我发现的这是一个穴居。 Oh. This furniture looks handmade. 噢,这家具是手工制作的。

发表于:2019-02-08 / 阅读(159) / 评论(0) 分类 咱们裸熊

Science and technology 科学技术 Invasive species 入侵物种 Boom and bust 繁衍与湮灭 Invasive Argentine ants may be less persistent than once feared 入侵性阿根廷蚂蚁可能没有想象的那么可怕 Ready for take-off 随时准备离

发表于:2019-02-16 / 阅读(155) / 评论(0) 分类 经济学人科技系列

Oceans Most Wanted 伴随着人们的经济活动和国际交往,一些物种由原生存地借助于人为作用或其他途径移居到另一个新的生存环境并在新的栖息地繁殖并建立稳定种群,这些物种被称为外来物种。

发表于:2019-03-09 / 阅读(273) / 评论(0) 分类 英语听力文摘 English Digest
学英语单词
Aconitum ciliare
acute postinfectious glomerulonephritis
advanced fighter technology integration
annelids
aquacades
arcsine law
bad-check
Baring, Alexander,lst Bar to Ashburton
bearing zone
big-money
brewer bubbler
brushoffs
buffalo hump
casuss
Claro, Ribeirão
color visions
contra-steam braking
COPD
dasypetalous
declination of compass
desulfurization chemicals
development chamber
epidemic pleuritis
eurojet
ex-partners
externally irregular point
fen crickets
flight recorder
floscule
gangway board
grape shot
H shaped iron
half through girder
hot oil process
hyperluteoidism
ice shelf
infinite value logic
instantaneous electronic scanning
interference lobe
intermittent sample
intradermal
ischemic preconditioning
keep a straight face
labor norm
least favorable prior distribution
lenticular printing
marine ship borer
mediate contour
medical physics
micro programming
music director
myxoglioma
N-methylphenylamine
Naica
narang
nominal drilling depth range
nuclear analyzer
oleite
on top (otp)
p17
paguristes antennarius
pantograph link
parallel roller bearing
parrall
perituberculosis
polyg
power control lever
pressure of return water
qdms
radar camouflage
recollimated
rectangular aluminum wire
rock substance
run something up
salted salmon belly
senile nanism
shear tool
sheathing canal
slide film
slow regeneration
special tonnage tax
stadda
starframe
sternopleural sternothyroideus
stevedore equipment
stupefiers
swabbing well
timber stick
to pull strings
traumatizing
two-step cold storage
Twomey
type b display
undeath
undelivered cargo list
up gaze
uranometrical
vaginifixura uteri
vehfculo
wade-in
Wilson Res.
Wooler