时间:2019-01-22 作者:英语课 分类:自然百科2011年


英语课

 We are at a foundry here, and they are pouring molten iron from all machinery 1. And they are going to make parts for new machines out of that iron, so they are recycling yet, but all that iron was created and ejected into the cosmos 2 by gigantic stars that exploded as supernovae. Those explosions created the iron and ejected into the cosmos, and then they got incorporated into planetary systems like ours, but ultimately the atoms of iron were created by exploding stars. Supernovae are the industrial zones of our star city, cosmic foundries in which the chemistry of the heavens forges new elements. 


 
 
 
It is fascinating to realize that the heavy elements in our bodies, the carbon in our cells, the calcium 3 in our bones, the oxygen that we breathe, the iron in our red blood cells. All of those heavy elements were synthesized, created through nuclear reactions in star, and ejected into the cosmos by supernovae. 
 
 
 
Only some stars are massive enough to die as supernovae. Most, like our sun, suffer a more gentle death. Most stars don’t die in the cataclysmic explosion. Our own sun, for example, a typical star, will die with a whimper not a bang. 
 
 
 
The death of most stars occurs when the battle, between gravity pulling in and nuclear energy pushing out, is won, not by gravity but by the nuclear energy.

n.(总称)机械,机器;机构
  • Has the machinery been put up ready for the broadcast?广播器材安装完毕了吗?
  • Machinery ought to be well maintained all the time.机器应该随时注意维护。
n.宇宙;秩序,和谐
  • Our world is but a small part of the cosmos.我们的世界仅仅是宇宙的一小部分而已。
  • Is there any other intelligent life elsewhere in the cosmos?在宇宙的其他星球上还存在别的有智慧的生物吗?
n.钙(化学符号Ca)
  • We need calcium to make bones.我们需要钙来壮骨。
  • Calcium is found most abundantly in milk.奶含钙最丰富。
学英语单词
absolute geopotential topography
airborne condition
amphibological
Antilusin
auxiliary lead
bandar fisheri formosae
benzoiodhydrin
bilinear functional
blogshop
bootham
bronze medal winner
brush reading
bucknalls
build-in calibrator
butt dialing
C.V.O.
carbolic acids
Caswell
coldcocks
confirmation signalling
contact-type heater
copels
corliss
cukraon
cyclical shift
cyclone air lock
D, d
delater
elephant tusk
emulsion flow properties
family of lattices
faradays
floating-ring shaft
frozen token
fructopyranose
gaming act wagering
genus Aegypius
get on someone's case
gravimetric measurement
hot-stuffed
impulsiveness
inferior temporal line
inner check valve guide
intermodulation effect
intervertebral disc punch
labour-related cost
Lindera nacusua
ludmila
maintenance bases
meat head
mom (method of moments)
Muslimophobes
Mustla
non-union worker
nonfalse
nut-rolls
operads
oxyhaemglobin
palm-oil chop
parentlike
peroneal retinacula
phosphori
picolyl
political sociology
politicalize
polyadenopathy
polyfunctional alcohol
pourover
power point
Proctopathy
proriasiform
rabbitless
radio-electrophysiolograph
rary-show
relief clauses
romantic guitar
S-shackle
she-ra
Sinex
Sino-European Container Liner Service
sociology of music
socked away
subtiligase
superhots
taarof
take precedence to
talsky
taste-testing
terminal dispensing station
through-flows
toe reflex
trip stud
turai
unequal addendum gear
vibrating-type converter
vinegar mother
Vojens
water supplies
weakenings
Xenia Zaragevna Onatopp
yappier