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
2025-05-08
28
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 Light. 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 the human eye without harming the front of the eye, simply by passing a laser beam right through the eyeball. No knives, no stitches (刀口缝合), no unwanted damage ——a true surgical wonder.
Operations which once left patients exhausted and in need of long periods 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 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 has meant that ______.
选项
A、in another ten years we shall be able to cure cancer
B、surgery is likely to improve considerably
C、we shall be able to treat all the diseases we suffer from
D、we are now able to treat most forms of cancer
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/4066909.html
相关试题推荐
Doctorsinthishospitalhavesuccessfully______100surgicaltreatmentstorem
Switzerlandis(best)knownforits(majesty)mountainrangeand(thousands)flo
Thousandsofyearsagomanusedhandyrocksforhissurgicaloperations.Lat
Thousandsofyearsagomanusedhandyrocksforhissurgicaloperations.Lat
Thousandsofyearsagomanusedhandyrocksforhissurgicaloperations.Lat
Thousandsofyearsagomanusedhandyrocksforhissurgicaloperations.Lat
Thousandsofyearsagomanusedhandyrocksforhissurgicaloperations.Lat
Infearfortheirlivesandin______oftheirfreedom,thousandsofenslavedwome
Doctorsinthishospitalhavesuccessfully______100surgicaltreatmentstorem
Switzerlandis(best)knownforits(majesty)mountainrangeand(thousands)flo
随机试题
Itiscommonlyheldthatdrinkingmoderateamountsofalcoholcanreducethe
A.区域性交感神经切除 B.动脉切开取栓术 C.动脉内膜剥脱术 D.大网膜
下列哪项不是克罗恩病的临床表现()A.腹部肿块 B.腹痛 C.便血
属于个人史的是A.月经情况 B.生育情况 C.冶游史 D.家族遗传
某钢筋混凝土结构工程分项,某月份的计划单价和计划工程量分别为420元/立方米和3
根据上述资料可以推出的是:A.2020年7月表格所列的各类限额以上单位商品中
图示梁ACB用积分法求变形时,确定积分常数的条件是(式中V为梁的挠度,θ为梁横截
一般资料:求助者,男性,17岁,高二学生。 案例介绍:因与同学、老师的关系不融
关于医疗事故技术鉴定组织的说法中,错误的是A.医疗事故技术鉴定组织是医学会 B
项目后评价成果并不是一成不变的,不同阶段的后评价对前期的后评价结果进行修正。这体
最新回复
(
0
)