细胞膜

Fish live in water, but do they drink it? The answer is yes, but how fish drink water depends on where they live. Water gets into a fish's body through osmosis, the process in which water diffuses from a higher to a lower concentration. For example,

发表于:2018-12-03 / 阅读(80) / 评论(0) 分类 初学者听力文摘精选

Rachel Lee: The housing market keeps losing steam. Sales of previously owned homes fell 5. 7% last month according to the National Association of Realtors. If you're looking for a house , the group's

发表于:2018-12-05 / 阅读(84) / 评论(0) 分类 商业报道2006年

Rock-Consuming Organisms Alter Views of Life Processes LOS ANGELES Kenneth Nealson can be described in many ways, including expert in microbiology and biochemistry. But that's not the one he is most proud of. People call me the 'father of Shewanella,

发表于:2018-12-08 / 阅读(67) / 评论(0) 分类 VOA标准英语2015年(一月)

Fish do drink water, but how they consume it depends on where they live. Water gets into a fishs body through osmosis, the process in which water diffuses from a higher to a lower concentration. 鱼儿确实喝水,但它们怎样喝水却取决于其

发表于:2018-12-28 / 阅读(48) / 评论(0) 分类 初学者听力文摘精选

For something that could revolutionize the world, its come along very slowly. The fuel cell was invented in 1839, but there was little development until the 1950s when NASA started to use them in space where they are still used today. Now, after yea

发表于:2018-12-30 / 阅读(120) / 评论(0) 分类 国家地理2008年

Glucosamine - a glucose or galactose molecule with an amine group attached. see also glucuronic acid. Glucose - a molecule of great importance to life as it provides a ready source of energy for both

发表于:2019-01-03 / 阅读(97) / 评论(0) 分类 医务英语

Enamel prisms - rod-like bundles of hydroxyapatie crystals which are orientated at right angles to the tooth surface. Each prism can be traced from the outside of the enamel all the way to the dentine

发表于:2019-01-03 / 阅读(64) / 评论(0) 分类 医务英语

In Vitro - experiments which are carried out in a laboratory as distinct from in vivo experiments In Vivo -experiments which are carried out in live animals as distinct from in vitro experiments Immun

发表于:2019-01-03 / 阅读(95) / 评论(0) 分类 医务英语

Lymphocytes - white cells involved in the immune response. B lymphocytes are so called because they mature in bone while T lymphocytes mature in the thymus. Both cells look alike until they recognise

发表于:2019-01-03 / 阅读(70) / 评论(0) 分类 医务英语

Dermatan sulphate - a glycosaminoglycan found in skin, tendon, blood vessel and heart valves. Desmosomes -one of the types of cell junctions by which cells join or communicate with each other. Desmoso

发表于:2019-01-03 / 阅读(95) / 评论(0) 分类 医务英语

Darwinian medicine - an approach to the treatment of infective diseases which takes account of the co-evolution between the host and its parasite. Deciduous - from the Latin

发表于:2019-01-03 / 阅读(62) / 评论(0) 分类 医务英语

Covalent bond - a strong bond between atoms formed by sharing outer electrons. When an atom has 8 outer electrons it is stable. Those which naturally have 8, like neon and argon gasses are quite unrea

发表于:2019-01-03 / 阅读(67) / 评论(0) 分类 医务英语

Symbiosis - a mutually beneficial inter-relationship between two organisms, for example between bees and flowers (pollen carrying in return for nectar). Sympathetic nerves - the sympathetic nervous sy

发表于:2019-01-03 / 阅读(57) / 评论(0) 分类 医务英语

Morphogenesis - the process in which tissue shapes and organ structures are developed during embryology. Morphogenic fieled - an environment in which the shape or pattern of a developing organ is dete

发表于:2019-01-03 / 阅读(95) / 评论(0) 分类 医务英语

VOICE ONE: This is SCIENCE IN THE NEWS in VOA Special English. I'm Barbara Klein. VOICE TWO: And I'm Steve Ember. This week, we will tell about an American study of the brain disorder schizophrenia. We tell about cars that use hydrogen as fuel. And,

发表于:2019-01-11 / 阅读(118) / 评论(0) 分类 VOA慢速英语2008(十)月

Study: Malaria Parasite Has Achilles Heel 研究发现疟原虫也有致命弱点 Researchers say they have found a weakness in the malaria parasite that could lead to new drugs to block infection. The mosquito-borne disease kills more than 600,000 p

发表于:2019-01-14 / 阅读(48) / 评论(0) 分类 VOA标准英语2014年(七月)

For something that could revolutionize the world, its come along very slowly. The fuel cell was invented in 1839, but there was little development until the 1950s when NASA started to use them in space where they are still used today. Now, after year

发表于:2019-01-22 / 阅读(75) / 评论(0) 分类 自然百科2008年

Fish live in water, but do they drink it? The answer is yes, but how fish drink water depends on where they live. Water gets into a fish's body through osmosis, the process in which water diffuses from a higher to a lower concentration. For example,

发表于:2019-01-26 / 阅读(72) / 评论(0) 分类 英语听力文摘 English Digest

Under normal circumstances, each of your brain cells allows various substances, such as sodium, calcium and potassium to permeate its outer cell membrane. Once inside the brain cell, these substances help give the cell stimulus it needs to function p

发表于:2019-01-26 / 阅读(64) / 评论(0) 分类 英语听力文摘 English Digest

There are several kinds of odor preventing and odor destroying treatments for textiles. For the most part, they work by killing or inhibiting the bacteria and fungi that cause odors. For example, these socks contain Quaternary Ammonium Compounds, or

发表于:2019-02-23 / 阅读(63) / 评论(0) 分类 英语时差8,16
学英语单词
air-fuel mixture
Anisotrop
Association of Oil Pipe Lines
attenuation stability
Auestacon
autoplotter
bar lake
be witness to
Berliners
Big Bass Drum
bivelangiocarpy
booster injection
Bovalino
built-in distinction
by a stretch of imagination
by continuity
candidate pool
casements
Cenomanian Age
cephalic lobe
Cherenkov
cleaner rod
colourless chromatogram
commission of a crime
danilone
diffuse maximum
earthquake strength
egg salads
electronic data processing (edp)
end-plates
factitive
fall lines
fine-grain developer
fjard
geopotential field
Glechoma hederaceae
gradient, temperature
grand justice conference
H and D curve
homalopoma tosaensis
homogeneous X-ray
horce
ikramuddin
impose fines on someone
information source with memory
Inland Revenue
interconnection function
inteript
intertrabecular
Jamshid,Jamshyd
jupiter probe
keylocks
kose
l'industrie
louiss
mattoirs
Melaspilea
Mikhaylovgrad
monochromatized
Mutsus
nitrodeoxycellulose
non-rotating earth
nucleus medullae oblongatae
oblongifolium
overall stage pressure ratio
panellist
phineas taylor barnums
Photian
plate erector
plow through
proctagia
prospecting instrument
provocative test
quick change drilling chuck in process
ramycin
rectifiable Jordan curves
resin tube
scruffier
season finales
sextuple space
slapstick
sleepier
social media policy
Spriochaeta
stamen hair
strobe pulse
subcascade
submarine humus
system of holdings
tension creep
thunderstricken
top-level function calls
Topic A
transpolarizer
universalism
unskewered
us mers
Value Added Process
valve lapper
viper's grass
WiFi camera
women of the house