时间:2018-12-15 作者:英语课 分类:新东方背诵文选


英语课

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.


1 nuclei
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。
2 wavelength
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。
3 wavelengths
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
4 spectrum
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。
学英语单词
a dope fiend
acute corner
agarum turneri post.et rupr.
ananthropism
antimony electrode
bean queen
bestestest
biocerin
bituminous industry
brail
brewerd
car stop
carpetgrass
cetologists
chalcovarin
cholinester
choreic movements
Clone Fund
coking coal
Collecchio
concurrence
cost,insurance,freight inland waterway
Coxeter-Dynkin diagrams
cyclic queueing network
dicyclopentadienyliron(ii) ferrocene
dysimmunity
eeriest
electrotempering
eolith(eolite)
evening
exercition
field-effects
frequency accuracy
fueling capacity
Furtwangen
hereditary stability
initY
integration of the vertical kind
INTMED
intraoperative soft tissue expansion
junior yearling
Khokhlovo
lichenist
lissitzky
mason's putty
mather & platt kier
Mazdaism
mazruis
metonymously
microencapsulator
moving stripper
multizone
nadhs
nergals
no matter
nonabsorptive
nonuniform quantizing
NSC-742
of-fice
oologize
original issue price of unit
palaeo-environmental
paper-making machinery
phase-alternation line system
photo-essay
piranga olivaceas
pollicization of first metacarpal bone
prime imiister
propeller guard
propylene liguid
pseudoallergy
quantum hadrodynamics
raphide sac
realised amounts
remez
sechiste
segregatively
simulated modeling
solid caustic soda section
species
spur gear planer
square packing slide ring
suicide bomber
swedging
tailgate parties
temperate zooplankton
time-scarcity
top doup
top sb up
topical remedy
trachytoid texture
tuncer
twin twisted
two-stream plasma
ventromedial hypothalamic syndrome
vertebral part of medial surface of lung
vibrating acceleration
vitamin bcs
Wooltana
xerographic copiers
Zhibiao