时间:2018-12-31 作者:英语课 分类:英语听力文摘 English Digest


英语课

   Lightning Helps Fertilize 1 The Soil


 
  Our bodies need protein, and proteins contain nitrogen. The air we breathe has plenty of nitrogen to satisfy our needs. But—that nitrogen is not available to us directly from the air. The only way we can get nitrogen is from the plants we eat, or from the animals we eat that eat the plants.
 
  Here’s The Problem:
 
  A nitrogenmolecule in the air consists of two atoms which are held together very tightly. In order for us to absorb nitrogen, the two atoms must be separated. But the two atoms are held together so tightly that our body chemistry does not have enough energy to process them.
 
  This is where lightning comes in. Obviously we don’t have to be struck by lighting 2 in order to satisfy our need for nitrogen!
 
  However, in a thunderstorm there is enough electrical energy in lightning to separate the nitrogen atoms in the air. Once the atoms are separated they can fall to earth with rain water, and combine with minerals in the soil to form nitrates, a type of fertilizer.
 
  The nitrogen-containing nitrates in the soil are absorbed by the plants, and when we eat the plants or the animals which eat the plants, we get the nitrogen in a form which our bodies can use.
 
  So, in addition to providing a spectacular light show, and scaring us to death, lightning also helps fertilize the soil.

v.使受精,施肥于,使肥沃
  • Fertilizer is a substance put on land to fertilize it.肥料是施在地里使之肥沃的物质。
  • Reading will fertilize his vocabulary.阅读会丰富他的词汇。
n.照明,光线的明暗,舞台灯光
  • The gas lamp gradually lost ground to electric lighting.煤气灯逐渐为电灯所代替。
  • The lighting in that restaurant is soft and romantic.那个餐馆照明柔和而且浪漫。
学英语单词
active nitrogen
Angelica archangelica L.
angiitises
antigen-presenting
antigravitation
appointed bank
assault-weapon
astrange
ata
automatic dissolver
automatic train length computer
bacteriologic filtration
basse - terre
bathymetry
beach buggy
black surround screen
blue story
bonsal
carbon brush for electric machine
chlorine suboxide
church-rate
cintern
clockwise helical polarization
contractile ring
cop knocks
cost estimate analysis
crisis-ridden
crystal phase
deliveress
diesel electric emergency set
discalceating
disseminatus lupus
eicke
elatostemma stewardii merr.
eunuchoidal
Fei Xiaotong
final sample
first - class cabin
flexible rubber insulated wire
forecast balance sheet
full-volume
Gaddafi, Muammar al-
gangster rap
general secretary
generalized soil map
gradient wind
Gruziya
guava ?
gyrosigma spencerii
hae
harshly
hemorrhagin unit
Hoe-118Piretanide
Hubbard County
Hupkok
hydro-carbon
hyperweb
I-pilus
intercepting steam chest
konne
laser bistable device
margalitic soil
maybird
measurement of personality
murmurate
neottia pseudonipponica
non-linear interaction of noisy waves
nonillness
Norman County
oscillating oil cylinder
overcast sky
pastalike
phase satellite system
phlycternulosis
physical fights
preventive substance
pseudopolymelia paraesthetica
pube styles
q.r.
releasing agent
shionone
Skuldelev
solid metal guide
spermatozoa insemination methods
spin forging machine
SQT (square-rooter)
subroutine segment
sweatshop
t?nia chorioidea
taiwan square-head snake
task manager
tenants of woods
to have an operation
valve lever clamp
vasculogenetic
voltage controlled avalanche oscillator
whistling face syndrome
wiper arm
wireless keyboard
world communications
worm-and-wheel steering gear