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
2024-08-13
55
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/3717666.html
相关试题推荐
Whilemilitaryscientiststestlasersagainstsatellites,surgeonsusethem
WhydoesAmericadecidetowithdrawsomeofitsmilitaryvehicles?[br][origin
WhydoesAmericadecidetowithdrawsomeofitsmilitaryvehicles?[br][origin
WhydoesAmericadecidetowithdrawsomeofitsmilitaryvehicles?[originaltext
科学家不应当把想象力让诗人独占了。(exclusiveuseof)Scientistsshouldnotallowpoetstheexclusi
Somescientiststhinkthatparentsmaketoobigfussabouthygiene,andthatdai
Somescientiststhinkthatparentsmaketoobigfussabouthygiene,andthatdai
Somescientiststhinkthatparentsmaketoobigfussabouthygiene,andthatdai
Somescientiststhinkthatparentsmaketoobigfussabouthygiene,andthatdai
Somescientiststhinkthatparentsmaketoobigfussabouthygiene,andthatdai
随机试题
Ireallyappreciateyour(offer)______tohelpme.offering本题测试的是动词的惯用法。“appreci
TheWhiteHouseistheofficialresidenceofthePresidentoftheUnitedSt
某公司拟配置存储容量不少于9TB的磁盘阵列用于存储数据。假设只能购买每块存储容量
2岁小孩,双侧先天性髋关节脱位.最佳治疗方案可选A.牵拉复位 B.手术切开复位
患者,男,46岁。心胸阵作隐痛,疾走则发,胸闷气短,动则甚,心悸,倦怠无力,神疲
婴儿添加辅食的原则,错误的是A.每种辅食都应从少量开始 B.由稠到稀 C.从
各种运输方式内外部的各个方面的构成和联系,就是( )。 A.运输系统
(2017年真题)甲企业生产一种产品,每件产品消耗材料10千克。预计本期产量15
甲公司拥有一栋办公楼,成本为1200万元,预计使用寿命为20年,预计净残值为20
非霍奇金淋巴瘤化疗首选的方案是() A.MP方案 B.CHOP方案 C.M
最新回复
(
0
)