汞[汽]扩散[真空]泵

useless 无用的,没有价值的 user 用户,使用者 usual 通常的,平常的 usually 通常 utility 效用,实用 utilise 实用 utilize 利用 utmost 极度的,极端的,极限 utter 完全的,彻底的说 vacant 空闲的,空缺的

发表于:2018-12-01 / 阅读(255) / 评论(0) 分类 大学英语四级词汇拼读版

今天要学的一个词是:pump。pump,Pump一般是指泵,或抽水机。可是今天讲的pump是指汽车加油站的泵。英国石油公司宣布停止在阿拉斯加的石油开采,《洛杉矶时报》的标题说:Oilfield Closure t

发表于:2018-12-04 / 阅读(241) / 评论(0) 分类 英语每日一词

She inspected the carpet for small items. She saw a paper clip and a rubber band. She picked them up. She put them into a little box on the kitchen counter. She plugged in the vacuum cleaner. She turned on the switch. The cat ran out of the room. She

发表于:2018-12-07 / 阅读(201) / 评论(0) 分类 原版英语小短文

Oliver went to Target to buy a new vacuum cleaner. The vacuum cleaners at Target cost $60 to $500. The expensive ones were too bulky and, of course, too expensive. He bought the cheapest one in the store: a Dirt Devil Vibe. Its label claimed that it

发表于:2018-12-11 / 阅读(224) / 评论(0) 分类 365个英语简短小故事

Studies that will be released today show that fish, birds and mammals in New England have significant amounts of mercury in their bodies. The studies find the toxic metal in some unexpected habitats and they suggest that power plants in the Midwest a

发表于:2018-12-17 / 阅读(301) / 评论(0) 分类 2009年NPR美国国家公共电台7月

The Mercury Mess By Samantha Levine / 2004, as first appeared in U.S. News nbsp; What are the dangers of mercury in fish? Can the mercury mess be cleaned up? 1 Are these fish safe to eat?” It’s a

发表于:2018-12-19 / 阅读(206) / 评论(0) 分类 彭蒙惠英语

This is Scientific American 60-Second Science. I'm Cynthia Graber. This will just take a minute. The fridge is one of your home's biggest energy hogs. Better insulation can make refrigerators much more efficient. And a panel encasing a vacuum is one

发表于:2018-12-24 / 阅读(210) / 评论(0) 分类 Scientific American(五)月

Rainforests exist because it rains a lot and that makes the forests grow, right? Well, not so fast. What if its not the rain that makes the forestswhat if its the forests that actually generate the rain? Thats the contention of a paper in BioScience

发表于:2019-01-02 / 阅读(246) / 评论(0) 分类 60秒科学

Rainforests exist because it rains a lot and that makes forests grow, right? Well, not so fast. What if its not the rain that makes the forests? What if its the forests that actually generate the rain? That is the contention of a paper in BioScience

发表于:2019-01-08 / 阅读(211) / 评论(0) 分类 Scientific American(五)月

The World Health Organization says heart disease kills about 17 million people every year and that it will become the leading cause of death in developing countries. But now, there is some hope. A new device is being marketed that could save countles

发表于:2019-01-13 / 阅读(230) / 评论(0) 分类 VOA标准英语2010年(一月)

He was going to ride his bike down to South Ferry. He squeezed the tires. They were soft. They needed air. I should buy a pump one of these days, he thought. He rode his bike to K-Mart on 34th Street. He walked the bike inside the store. He went to t

发表于:2019-01-22 / 阅读(233) / 评论(0) 分类 英文短篇故事(纽约)

Science and technology 科学技术 Creutzfeldt-Jakob disease 克雅氏病 Breaking down the barrier 攻破屏障 A glimmer of hope for a drug that treats disease caused by prions 药物治疗朊病毒感染疾病的一线希望 THE epidemic of mad-c

发表于:2019-01-26 / 阅读(262) / 评论(0) 分类 经济学人科技系列

SCIENCE IN THE NEWS - Mercury in Fish / Life on Land / The Goldman Environmental Prize By Broadcast: Tuesday, May 11, 2004 (THEME) VOICE ONE: This is SCIENCE IN THE NEWS, in VOA Special English. I'm B

发表于:2019-01-30 / 阅读(340) / 评论(0) 分类 科技之光

The U.S. space agency(代理中介) has released the first ever image taken of the surface of Mercury from a spacecraft orbiting the planet. The black and white image, posted on the NASA website Tuesday, shows a surface pocked with craters of varying

发表于:2019-01-31 / 阅读(216) / 评论(0) 分类 英语新闻

今天要学的一个词是:pump。pump,Pump一般是指泵,或抽水机。可是今天讲的pump是指汽车加油站的泵。英国石油公司宣布停止在阿拉斯加的石油开采,《洛杉矶时报》的标题说:Oilfield Closure t

发表于:2019-02-02 / 阅读(250) / 评论(0) 分类 英语单词荟萃

CAPE CANAVERAL Two American astronauts will venture outside the International Space Station Monday to stow a failed coolant pump and extend the outpost's Canadian railway. Wearing protective spacesuits in a deadly vacuum(真空) environment, Stephen

发表于:2019-02-05 / 阅读(257) / 评论(0) 分类 英语新闻

By Paul Sisco Washington, DC 15 February 2008 Scientists have started analyzing data and images acquired when the Messenger space probe passed within 200 kilometers of the planet Mercury last month. It was the first flyby of the solar system's inner-

发表于:2019-02-06 / 阅读(268) / 评论(0) 分类 VOA常速英语2008年(二月)

BEIJING, Oct. 21 (Xinhuanet) -- A team of European researchers announced that they have found vast water vapor out of our solar system, according to a study in the U.S. journal Science Friday. Using Herschel Space Observatory, a European Space Agency

发表于:2019-02-09 / 阅读(220) / 评论(0) 分类 英语新闻

今天要学的一个词是:pump。pump,Pump一般是指泵,或抽水机。可是今天讲的pump是指汽车加油站的泵。英国石油公司宣布停止在阿拉斯加的石油开采,《洛杉矶时报》的标题说:Oilfield Closure t

发表于:2019-02-16 / 阅读(249) / 评论(0) 分类 学个词

Toxin-loving Trees 树木能调节气候,保持生态平衡,树木通过光合作用,吸进二氧化碳,吐出氧气,使空气清洁,新鲜。一亩树林放出的氧气够65人呼吸一辈子。树还能防风固沙,涵养水土,吸收各种粉

发表于:2019-02-24 / 阅读(278) / 评论(0) 分类 英语听力文摘 English Digest
学英语单词
-nitrile
a k
actic
Aderno
aircraft industry
al mahwit
anadenia
Animal Basin
anomala rubripes virescens
Arhtrotardigrada
asialia
Asrs
auction order
authorization expiration date
bald face
Ban Kok
bead-roll
cement additives
Chiprana
circulating indicator
civilian labour force
composite volcano
conic graph
continuous automatic aim
convulxin
current-account
desmoplastic malignant melanoma
ecoimmunology
electorates
elsinoe rande jenkins et bitancourt
Empty a Leg
Ferolix
flat head
flemish school
flocculable
galanterie
GALEASPIDIFORMES
galva
gravity prospecting method
gust front
gyroscopic torque
heptadecenoyl
hinayanists
hold-down assembly
horseshoe shrimp
Hub-bard tank bath
hypopigmentations
Ilderton
Illara
instantaneous gas oil ratio
interaction fault
itis cardiovascular disease
jehovistic
Kalman-Bucy filtering
lit candles
look the picture of despair
lorryfuls
magnet reflex
mauvine
microellipticity
misdivision (darlington 1939)
mixed coniferous broad leaved forest
official logbook
offset transaction
on/off operation mode
originating entity
passive symptom
peak electrode current
piezometric ring
policy address
powerscourt
primary sensory cells
quater center
renounce the cloth
reorganization of capital
Resabetophenone
scanning distortion of video signal
sclerodermatomyositis
secondary earth
secondary myocardosis
seedplots
siblicide
space hold
spraying process
Springsteenian
subcritical equilibrium
sugar phosphate
supercapacitor
tailard
TDAD
teleprocessing network
the rot
tin(ii) basic nitrate
tracheal pouch formation
ultrasonic resonance absorption
undistinguishably
unprisonable
unritualistic
upstartled
Verkhnyaya Tura
voice activation
Wolfe City