时间:2018-12-03 作者:英语课 分类:英语时差8,16


英语课
The deserts of the southwestern United States stretch, in an irregular pattern, from Oregon southward to beyond the Mexican border and from California to West Texas.
  
Although they vary widely in terrain 1 and temperature, these lands share one trait: extreme dryness. 
 
Dryness in the southwest U.S. can be traced to two sources: a high-pressure system called the North Pacific High, and a phenomenon called the rain-shadowing effect of mountains. 
 
The North Pacific High is part of a relatively 2 stable high pressure system in the Pacific Ocean that influences the weather from northern Mexico, to the far-west and Southwest United States. In a high pressure system, air from up above tends to move downward to ground level. As the air descends 3, it grows warmer and its relative humidity drops. Clear skies and dry weather result. 
 
Rain shadow is the result of the prevailing 4 westerly winds losing most of their moisture to the mountain ranges on the western edge of the desert lands. The western Sierra Nevada, for example, receives ten times as much precipitation as areas immediately to the east. 
 
Combined, the North Pacific High and rain-shadowing create an extremely dry climate. Parts of the Sonoran and Mojave Deserts receive only one and a half inches of rainfall a year. When rain does come, it is often in short cloudbursts that dump water on the dry land more quickly than it can be absorbed, resulting in flash floods. During "false" thunderstorms, common during the hot summer months, rain evaporates before reaching the ground.  
 

1 terrain
n.地面,地形,地图
  • He had made a detailed study of the terrain.他对地形作了缜密的研究。
  • He knows the terrain of this locality like the back of his hand.他对这一带的地形了如指掌。
2 relatively
adv.比较...地,相对地
  • The rabbit is a relatively recent introduction in Australia.兔子是相对较新引入澳大利亚的物种。
  • The operation was relatively painless.手术相对来说不痛。
3 descends
v.下来( descend的第三人称单数 );下去;下降;下斜
  • This festival descends from a religious rite. 这个节日起源于宗教仪式。 来自《简明英汉词典》
  • The path descends steeply to the village. 小路陡直而下直到村子。 来自《简明英汉词典》
4 prevailing
adj.盛行的;占优势的;主要的
  • She wears a fashionable hair style prevailing in the city.她的发型是这个城市流行的款式。
  • This reflects attitudes and values prevailing in society.这反映了社会上盛行的态度和价值观。
学英语单词
adactyl fetus
alopecia totalis
amphigouri
ante-uppings
antibrachii
antisecrecy
AShBM
average outgoing qualtity levelaoql
be raised to the purple
benocyclidine
bicolor
biopsychiatric
bird-nesting
bromochloroacetic acid
Bunetzone
burchett
burning-on method
buzzman
carrier-bornes
carvalho de egas
Cento Croci, P.di
chronic intermittent recurrent aphthae
co-saviour
cold-finger
Compiègne, Forêt de
comptroller
concave roll
costiform
cross and resident assembler
default print settings
Devanagari
diamond cubic
draught tube bend
Drive C
e-market maker
edens
edge blower
elevated tank
embedded object
enchanter
enginist
environmental newsletters
Eustis' test
fascist dictatorship
He that is afraid of wounds must not come near a battle.
HEL-M
human system
hypochromic shift
import tariffs
indurant
informal justice
instantaneous overload
internal-frame
Kaminokae
kykuit
land-carriage
laser lighthouse
live stage
lyrisms
methyl abietate
moveableness
multi-fuelled
nasolaryngoscopy
noncandidates
nuclear-missile
online interactive system
organized array
original issue
out of rule
out of the woods
overflow (incalculators)
pick button
plutonium regeneration
Point to Point Tunneling Protocol
precoracoid process
product ion
prompt jump approximation
proportional flow control valve
region-dependent segmentation
remote television
Ronnie Biggs
salmon-fishing
sand-blasting abrasive
scanning disk
sea hag
selector pulse
sequence of event
Sirius Radio
smooth away
speak highly
static buffering
stress-relieving cavity
Surgestone
survey at stop
systema nervorum sympathicum
track scale
up down counter
vacuum suction filter
Vodan
water-distributing pipe
windbounds
withdrawal force