高中英语人教版高二下课文08

[11:34.02]It may also be used to hide things that we do not want others to see.
[11:40.58]Don't touch that knife
[11:43.82]Most of us probably hope that we will never have to face major surgery.
[11:49.56]Even thought doctors are well-trained and modern
[11:54.03]technology makes it possible to save lives,
[11:58.58]many operations are still dangerous and painful.
[12:03.04]Now,however,scientists believe
[12:07.48]that they might be able to help doctors to cure patients with less risk.
[12:13.54]A new and very small robot has been invented.
[12:18.40]This robot can enter the human body through a small hole
[12:23.86]so that it is no longer necessary to cut the patient.
[12:28.83]Instead of using knives and other large tools,
[12:33.40]doctors can use a computer to move the tiny robot around.
[12:39.33]if the technology can be used on human beings,
[12:43.98]operations will be safer and less painful.
[12:48.94]That will never work,or will it?
[12:53.20]The most exciting inventions are always the ones that have  not yet been made.
[12:58.87]The true challenge for any inventor is to dare to dream and believe
[13:05.21]that what seems impossible today may one day become possible.
[13:11.17]Among the many inventions that are being discussed by some scientists
[13:16.73] are several that may seem ridiculous to us.
[13:21.59]For example,one scientist is trying to build a device
[13:27.16]that will allow information to enter the human body.
[13:32.12]In early experiments,
[13:35.36]the scientist was able to send sound into humans and dolphins,
[13:41.00]with some success.
[13:44.16]He is now working on sending visual information to the brain,
[13:49.44]so that blind people could be able to "see".
[13:54.72]The scientist believes that is may be possible to "learn"
[14:00.18]by sending information to the brain.
[14:04.33]Other inventors are trying to make something out of nothing.
[14:09.06]One group of scientists
[14:12.72]think that it may be possible to make energy from space itself.
[14:18.59]According to their theories,
[14:22.15]what we think of as empty space
[14:26.51]does in fact sontain energy in the form of movement.
[14:32.07]They describe space as true "perpetual motion",
[14:37.14]that is,movement that never stops.
[14:41.50]They claim that there are energy fields everywhere
[14:45.94]--because of the laws of physics,there are always small movements everywhere.
[14:52.19]Forhundreds of years,people have tried to build machines that never stop,
[14:58.35]but the laws of physics show that it cannot be done.
[15:03.39]The "space motion",however,could turn out to be endless.
[15:09.74]The scientists working on the programme
[15:13.58]believe that these fields of energy can be put to work.
[15:18.44]If they are successful,
[15:21.68]a new and cheap energy source will become available to us.
[15:27.14]It should be said that most scientists
[15:31.40]think that these inventions will never work.
[15:35.37]perhaps they are right,
[15:38.42]but we would do well to keep in mind
[15:42.55]that many inventions that we now take for granted were greeted with doubt.
[15:48.58]People laughed at Benjamin Franklin's early discoveries
[15:53.42]and many other great scientists
[15:57.05]had to wait many years before their ideas were accepted.
[16:02.61]It is also important to remember
[16:06.56]that new inventions do not always work well in the beginning
[16:11.91]--a good example is the first airplane,
[16:16.17]which only flew a very short distance.