时间:2019-01-08 作者:英语课 分类:英语小短文


英语课

   The source of Energy


  A summary of the physical and chemical nature of life must begin, not on the Earth, but in the Sun; in fact, at the Sun's very center. It is here that is to be found the source of the energy that the Sun constantly pours out into space as light and heat. This energy is librated at the center of the Sun as billions upon billions of nuclei 1 of hydrogen atoms collide with each other and fuse together to form nuclei of helium, and in doing so, release some of the energy that is stored in the nuclei of atoms. The output of light and heat of the Sun requires that some 600 million tons of hydrogen be converted into helium in the Sun every second. This the Sun has been doing for several thousands of millions of year.
  The nuclear energy is released at the Sun's center as high-energy gamma radiation, a form of electromagnetic radiation like light and radio waves, only of very much shorter wavelength 2. This gamma radiation is absorbed by atoms inside the Sun to be reemitted at slightly longer wavelengths 3. This radiation , in its turn is absorbed and reemitted. As the energy filters through the layers of the solar interior, it passes through the X-ray part of the spectrum 4 eventually becoming light. At this stage, it has reached what we call the solar surface, and can escape into space without being absorbed further by solar atoms. A very small fraction of the Sun's light and heat is emitted in such directions that after passing unhindered through interplanetary space, it hits the Earth.

n.核
  • To free electrons, something has to make them whirl fast enough to break away from their nuclei. 为了释放电子,必须使电子高速旋转而足以摆脱原子核的束缚。
  • Energy is released by the fission of atomic nuclei. 能量是由原子核分裂释放出来的。
n.波长
  • The authorities were unable to jam this wavelength.当局无法干扰这一波长。
  • Radio One has broadcast on this wavelength for years.广播1台已经用这个波长广播多年了。
n.波长( wavelength的名词复数 );具有相同的/不同的思路;合拍;不合拍
  • I find him difficult to talk to—we're on completely different wavelengths. 我没法和他谈话,因为我们俩完全不对路。 来自《简明英汉词典》
  • Sunlight consists of different wavelengths of radiation. 阳光由几种不同波长的射线组成。 来自辞典例句
n.谱,光谱,频谱;范围,幅度,系列
  • This is a kind of atomic spectrum.这是一种原子光谱。
  • We have known much of the constitution of the solar spectrum.关于太阳光谱的构成,我们已了解不少。
标签: 英语短文
学英语单词
acknowledgement by partial performance
aerofloated sulfur
Alternanthera
angelence
angularoscillation
Aulnay-sous-Bois
bed-sittings
bitless
boompipe
brush sweeper
caperberries
centre adjustment
CFV
cold-cathode canalray tube
control path
cringingness
Crnook
cycle ambliguity
cyclopentanespirocyclobutyl
daily back up volume
dangerous when wet
debasingly
Dermatectasy
design instruction
dimidiate hermaphroditism
discriminating dose
distributing centre
Dmitri Dmitrievich Shostakovich
doughnut holes
dramatisers
endothelio-leiomyoma (myosarcoma)
excess-pressure valve
fatal sisters
frameshift suppression
germchit
gonorrheal arthralgia
graphite-moderated
ground-based terminal
guysard
H2O2
heavy weight rubber product
hypoglycosylation
incubatorium
interfusing
internal twisted tape
Jones,Anson
kerions
land-grabbing
leftback
library, board
listening chain
ludek
lujavrite
mansoura
megachile disjunctiformis
Monmouth, James Scott
mudflow levee
multiplicity reactivation
natural aspirated diesel engine
non-insurable
ornithoscopy
Orpheite
oxyphyte
pacific red cedar
papert
para-Aminoazobenzene
passiflorin
pavlick
pendant control
pigmentary purpuric eruption
Princeton Plan
programmable open system
range at maximum speed
recaulking
regiones infrascapularis
residential cell
retting poud
Ricorta cheese
scissor-bites
secondary route
sequence-controlled contacts
single sided double-density diskette
Spencerian
sphere spark-gap
stakeknife
stream gravity
stretch dark region
supernerdy
superplasticization
syntonizers
talk one's head off
targetry
the owner
time complexities
tittish
tree trunks
types of swine
vapo(u)r plating
video projectors
Wadesville
woollybutt
zoologik