时间:2018-12-08 作者:英语课 分类:背诵为王第四册


英语课

Lesson51 Dolphins

Some people think that dolphins have a real language and that if we couldlearn their language; we could eventually start talking to them anddiscussing the important news of the day.

Sadly, this is only a dream. They may have very big brains and they may makelots of strange noises, but they do not, if we are honest about it, have atrue language. It is nice to think they do, but it is simply not thecase.They do, however, have a very special talent for using their noises tofind their way about the oceans and to locate shoals of fish. This is a kindof sonar - an echo-location system. What happens is that the dolphin swimsalong, chirping 2 and squeaking 4, and these very high-pitched sounds spreadthrough the water until they hit some solid object. Then the sound-wavesbounce back to the dolphin. The animal can tell how far away the object isby checking how long it takes for the sound to reach him. This feature ofsound detection is copied by human beings onto some devices used insubmarines, helping 5 them to locate objects and avoid collisions.

With all its special qualities, it is easy to see why we find the dolphin soattractive. It has graceful 6 movement, it is intelligent, it is helpful tothose in trouble, it has a playful character and it has a face that alwayslooks happy.

These are all qualities we admire in human beings, so it is not surprisingthat we are so fond of the dolphin.


shoal 鱼群

chirp 1 吱喳而鸣

squeak 3 发吱吱声


海豚

有些人认为海豚有真正的语言,如果能学会它们的语言,我们就能最终和它们交谈,谈论当今重要的新闻。可惜的是,这只是一个梦想。海豚拥有很大的大脑,能够发出许多奇怪的声音,但是老实讲,它们并不拥有真正的语言。能这样认为固然不错,但这不是事实。

然而,海豚确实有特殊的才能,可以利用它们发出的声音在大海里探路和确定鱼群的位置。这是一种声纳装置,一种回声定位系统。具体来讲,海豚边游动边发出嘁嘁喳喳的声音,这些音调很高的声音在水里传播,碰上坚硬的物体后,声波就返回到了海豚。通过声音返回所需的时间,海豚就能确定物体有多远。人类模仿海豚这种声音探测的特征发明了一些潜水艇用的定位和避免碰撞的装置。

海豚具有如此多独特的品质,那就不难理解它为什么那么惹人喜爱了。它动作优雅,聪明伶俐,乐于帮助处于危难之中的人,它生性好玩,还有一张看上去总是很快乐的脸。

这些都是我们人类崇尚的品质,所以我们如此喜欢海豚就一点也不奇怪了。



1 chirp
v.(尤指鸟)唧唧喳喳的叫
  • The birds chirp merrily at the top of tree.鸟儿在枝头欢快地啾啾鸣唱。
  • The sparrows chirp outside the window every morning.麻雀每天清晨在窗外嘁嘁喳喳地叫。
2 chirping
鸟叫,虫鸣( chirp的现在分词 )
  • The birds,chirping relentlessly,woke us up at daybreak. 破晓时鸟儿不断吱吱地叫,把我们吵醒了。
  • The birds are chirping merrily. 鸟儿在欢快地鸣叫着。
3 squeak
n.吱吱声,逃脱;v.(发出)吱吱叫,侥幸通过;(俚)告密
  • I don't want to hear another squeak out of you!我不想再听到你出声!
  • We won the game,but it was a narrow squeak.我们打赢了这场球赛,不过是侥幸取胜。
4 squeaking
v.短促地尖叫( squeak的现在分词 );吱吱叫;告密;充当告密者
  • Squeaking floorboards should be screwed down. 踏上去咯咯作响的地板应用螺钉钉住。 来自《简明英汉词典》
  • Can you hear the mice squeaking? 你听到老鼠吱吱叫吗? 来自《简明英汉词典》
5 helping
n.食物的一份&adj.帮助人的,辅助的
  • The poor children regularly pony up for a second helping of my hamburger. 那些可怜的孩子们总是要求我把我的汉堡包再给他们一份。
  • By doing this, they may at times be helping to restore competition. 这样一来, 他在某些时候,有助于竞争的加强。
6 graceful
adj.优美的,优雅的;得体的
  • His movements on the parallel bars were very graceful.他的双杠动作可帅了!
  • The ballet dancer is so graceful.芭蕾舞演员的姿态是如此的优美。
学英语单词
accrual principle
ad banner
adhesive failure
Adidiema
Air Force One
alkaline extracts of soils
angular overlap
arced up
array grammar
assisted memory
average profit
ball off
Baphicacanthus
body centrum
breed reactor
bring sb. in guitly
carbonaceous parting
cast by
chalkboard
check card
Chenopodium aristatum
Chinese speech information processing
class a ip
Clocaenog
coaitis
Command bar
contraband of war
contributing error
debtor country
disc module
Effontil
electronic photogrammetry
fire retardants
flameproof finishing
flat-compound dynamo
FMBs
free quasiparticle approximation
front engine
Geogia holly
hemi-aonil
humic acid combined fertilizer
hydroxylamine rearrangement
illegitimatizes
improper noun
inter-block
kitto
lateral cutaneous nerve of forearm
Linjiang
load variation
marine hydraulic fluid purifier
matzoon milk
mevorah
miner's horn
minor scale division
motion link
mysticality
new sol
nittiness
non-socialist
open-end pipe pile
operate time
oreoselinum
out-of-sequence control rod
output section
plant expansion
polyplastids
pressure surge
quayer
refrigerated rollingstock
regional coding
safety system support features
Saiyid Mūsa
sam-cloth
sand scrubber
Sberman-Chase assay test
seismicity
self-offender
shp
slow neutron filter
spatiotemporal mode
speculative investment
sssasisds-s
Staphylococcus aureus
statutory exemption
stew oneself
Stockhausen
stomatitis aphthosa
tag lines
terabecquerels
terminating power meter
thermal expansion and shrinkage
total ridge count
TTMS (telephone transmission measuring set)
UniData
uniform naming convention
vagueish
villela
watt hour capacity
worked out
yipper