首页
登录
职称英语
Thousands of years ago man used handy rocks for his surgical operations. Lat
Thousands of years ago man used handy rocks for his surgical operations. Lat
游客
2024-02-05
14
管理
问题
Thousands of years ago man used handy rocks for his surgical operations. Later he used sharp bone or horn, metal knives and more recently, rubber and plastic and that was where we stuck, in surgical instrument terms, for many years. In the 1960s a new tool was developed, one which was, first of all, to be of great practical use to the armed forces and industry, but which was also, in time, to revolutionize the art and science of surgery.
The tool is the laser and it is being used by more and more surgeons all over the world, for a very large number of different complaints. The word "laser" means: light amplification by stimulated emission of radiation. As we all know, light is hot, any source of light — from the sun itself down to a humble match burning — will give warmth. But light is usually spread out over a wide area. The light in a laser beam, however, is concentrated. This means that a light with no more power than that produced by an ordinary electric light bulb becomes intensely strong as it is concentrated to a pinpoint-sized beam.
Experiments with these pinpoint beams showed researchers that different energy sources produce beams that have a particular effect on certain living cells. It is now possible for eye surgeons to operate on the back of human eye without harming the front of the eye, simply by passing a laser beam right through the eye-ball. No knives, no stitches, no unwanted damage — a true surgical wonder. Operations which once left patients exhausted and in need of long period of recovery time now leave them feeling relaxed and comfortable. So much more difficult operations can now be tried.
The rapid development of laser techniques in the past ten years has made it clear that the future is likely to be very exciting. Perhaps some cancers will be treated with laser in a way that makes surgery not only safer but also more effective. Altogether, tomorrow may see more and more information coming to light on the diseases which can be treated medically. [br] The rapid development of laser techniques means that______.
选项
A、in another ten years we shall be able to cure cancer
B、we shall be capable of treating all the diseases
C、patients do not have to suffer any pain
D、surgery is likely to improve considerably
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3425120.html
相关试题推荐
Thousandsofyearsagomanusedhandyrocksforhissurgicaloperations.Lat
Thousandsofyearsagomanusedhandyrocksforhissurgicaloperations.Lat
[originaltext]Jointhethousandsofprofessionalsandinternationaltravele
[originaltext]Jointhethousandsofprofessionalsandinternationaltravele
[originaltext]Jointhethousandsofprofessionalsandinternationaltravele
Thethousandsofpeopleforcedtoabandontheirhomesinrecentweekstoflo
Thethousandsofpeopleforcedtoabandontheirhomesinrecentweekstoflo
Thethousandsofpeopleforcedtoabandontheirhomesinrecentweekstoflo
Thousandsofyearsagomanusedhandyrocksforhissurgicaloperations.Lat
Thethousandsofpeopleforcedtoabandontheirhomesinrecentweekstoflo
随机试题
Childrenareinneedofadoptionbecausesomebirthparentsareunableorun
[originaltext]Manypeoplesufferfromsomeformofextremeanxiety.Someex
[originaltext]M:Themainrequirementsforgraduationarebeingchanged.W:Ye
关于胎儿头围的描述,不正确的是A.头围测量可全面显示出胎头的实际大小 B.孕3
不道德的人体实验是A.欺骗实验 B.自愿实验 C.自体实验 D.天然实验
苇茎汤的功用是A.清肺化痰,逐瘀排脓B.清肺平喘,活血排脓C.润肺化痰,止咳排脓
对结核分枝杆菌具有高度特异性A.异烟肼 B.氨苯砜 C.链霉素 D.对氨基
下列哪项不是计算机信息系统的构成要素?()A.软件 B.数据 C.网络
以再测法或复本法求信度,两次测验相隔时间越短,其信度系数越()。(2009-05
变异系数越大,表示:A.相对变异程度越大 B.样本含量越大 C.标准差越小
最新回复
(
0
)