时间:2018-12-01 作者:英语课 分类:新东方CET6阅读


英语课

How does light get from the sun to the earth? How does music get from the stage to the audience? They move the same way —in waves!



Light and sound are forms of energy. All waves carry energy, but they may carry it differently. Light and sound travel through different kinds of matter. For example, light waves cannot move through walls, but sound waves can. That is why you can hear people talking in another room even though you cannot see hem 1. The energy of some waves is destructive. An arthquake produces seismic 2 waves.



Catch a wave. Ask a friend to stand a few feet away from you. Stretch a spring between you. Shake the spring to transfer energy to it. What happens? The spring bounces up and down in waves. When the waves reach your friend, they bounce back to you!



Light waves travel 300,000 kilometers (186, 000 miles) per second! They can also travel through a vacuum. That is why light from the sun and distant stars can travel through space to the earth!



1 hem
n.贴边,镶边;vt.缝贴边;(in)包围,限制
  • The hem on her skirt needs sewing.她裙子上的褶边需要缝一缝。
  • The hem of your dress needs to be let down an inch.你衣服的折边有必要放长1英寸。
2 seismic
a.地震的,地震强度的
  • Earthquakes produce two types of seismic waves.地震产生两种地震波。
  • The latest seismic activity was also felt in northern Kenya.肯尼亚北部也感觉到了最近的地震活动。
学英语单词
99Tc-Succimer
a earth satellite
a skull
achnacarries
amentia partialis
articled clerk
articulus genus
bay-area
Bermbeck
Bernouilli
bifolios
blending fuel
boil-off assistant
bring onto
cesium monoxide
Chari-dake
chlorocurorine
chrisler
cleaning of element
creep feeds
cupuliformis
dam movable
ddi
derogates
diasonograph
diphenylmethane dye
distributed authentication security service
divaricated
divided rim
double metallic standard system
electronic-hydraulic automatic leveling device
enuresis
episymbionts
erythrin
eubacterium alactolyticum
fawn ram (thailand)
financing system
finching
fineoak
floating grain discharger
Forrest County
generation of systems engineering
graphics plane
hardfast
helisterine
heterophyes disease
hypotrachyna pseudosinuosa
Inca de Oro
interveined
isohumes
judicial principles
juniate r.
kettle depression
laminae horizontalis
last accrual date
lead in inductance
LEPIDOTIDAE
limit state analysis
lindackerite
locally distributed processor
locked twin
Lystrosaurus
main control board
malleolus
maximum diameter of gear cut
mental management
merit rating for clerical jobholder's
methyl benzene
monetizers
mud filtrate resistivity
noise from thermal power plant
obsequent river
palmitoyltransferases
phase controlled circuit breaker
piloted reducer
Pine I.
pinisi
platesful
plumetty
ptysmagogue
Purtscher's disease
resonance field
rotovisko viscometer
rutile titanium dioxide
Settlement of Cargo Claims
shifting beam
shin
signal model
squoval
stake someone to something
streptoneury
sulfonic group
supported at two edges
tectonic epochs
telemorphic
Teridax
thalamite
venosclerosis
whitelisted
wiegmann
Yerachimo
zoomaric