首页
登录
职称英语
While military scientists test lasers against satellites, surgeons use them
While military scientists test lasers against satellites, surgeons use them
游客
2023-10-16
15
管理
问题
While military scientists test lasers against satellites, surgeons use them as miraculously accurate scalpels(外科用小刀). They can even be used to detonate hydrogen bombs. (81)
The beam can be focused to spot one fiftieth the size of a human hair, yet its intensity is enough to kill cancer cells or drill through the most delicate bones.
More than a decade ago, eye surgeons realized that they could use laser’s beam to seal individually, the microscopic blood vessels in the retina (视网膜). The beam is so fine that only the target is heated. Now its pinpoint blasting power has been turned to destroying cancer cells and reducing birthmarks. For cancer treatment, the diseased cells must be killed while their healthy neighbors are left unharmed. (82)
Where the cancer can be directly and accurately attacked, laser treatment does well: early cancer of the cervix (颈) and skin cancers have been widely and successfully treated.
This type of cancer is not very easy to reach. (83)
For cancers that are less accessible there is a new and potentially valuable technique in which the patient is injected with a chemical that then attaches itself preferentially to cancer cells. When the laser strikes the chemical, it releases a form of oxygen that kills these cells.
Birthmarks, once almost untreatable, are a mass of blood vessels and, being red, they absorb the laser beam strongly. It seals them so that the mark becomes less conspicuous. (84)
The normal cells of the skin’s surface, which don’t absorb much of the laser beam, act in the healing and help to conceal the mark.
The beam can cut with a precision that no scalpel could achieve. (85)
The operation can transform the lives of people who were previously doomed to a lifetime of cosmetic concealment.
Though this application is widely used in America, there are in Britain only two hospitals offering the treatment, and one feels bound to warn patients that success is not certain. However, some 10 new centers will soon be opened. Britain, though, is one of the leaders in the laser treatment of bleeding peptic ulcers (胃溃疡) and this, combined with new medicines can mean ulcer treatment without conventional surgery. The laser is now being used to treat all kinds of illnesses in this country. [br]
选项
答案
对于激光能够直接并准确地照射到癌变部位的癌症,激光治疗非常有效。在治疗早期颈癌和皮肤癌方面,这种疗法得到了广泛的应用,并获得了成功。
解析
(此句为倒装结构,由于定语从句Where the cancer can be directly and accurately attacked太长,将其放在句首以免句子前后不平衡。)
转载请注明原文地址:https://tihaiku.com/zcyy/3103050.html
相关试题推荐
Scientistsknowthattherearetwobasicapproachestoprolongingforlife.
Scientistsknowthattherearetwobasicapproachestoprolongingforlife.
Scientistsknowthattherearetwobasicapproachestoprolongingforlife.
Scientistsknowthattherearetwobasicapproachestoprolongingforlife.
Scientistsknowthattherearetwobasicapproachestoprolongingforlife.
Scientistsknowthattherearetwobasicapproachestoprolongingforlife.
Scientistsknowthattherearetwobasicapproachestoprolongingforlife.
Dr.Light,whois______tobeoneofthebestsurgeonsinLondon,performedtheo
WhydotheIsraeliforcesthreatentocarryoutamassiveoffensiveagainstthe
WhydotheIsraeliforcesthreatentocarryoutamassiveoffensiveagainstthe
随机试题
Completethenotesbelow.WriteONEWORDAND/ORANUMBERforeachanswer.
Googleisstillrecognizedasthebestgeneralwebsearchengine.Recognizin
[originaltext]InHollywood,everybodywantstoberich,famousandbeautifu
某项在用低值易耗品,原价1000元,按“五五”摊销法,账面余额为500元,该低值
中满分消丸主要用于A.鼓胀之气滞湿阻证 B.鼓胀之水热蕴结证 C.鼓胀之水湿
A.酒B.醋C.盐D.蜜E.姜汁能通血脉,行药势,矫嗅矫味,引药上行的辅料是
2014—2019年,全国风电发电量同比增速超过20%的年份有( )个
工程咨询业的质量管理原则之一是()。A.全面性 B.持续改进 C.责任感
老王家的鱼塘养有甲鱼、鲤鱼和鲢鱼,其中甲鱼需要每隔11天喂一次,鲤鱼需要每隔8天
(2018年真题)期货交易的结算和交割,由()统一组织进行。A.期货公司
最新回复
(
0
)