首页
登录
职称英语
At five feet, it can warn of a tumor no bigger than a pinprick deep in the b
At five feet, it can warn of a tumor no bigger than a pinprick deep in the b
游客
2023-09-12
15
管理
问题
At five feet, it can warn of a tumor no bigger than a pinprick deep in the breast. It can scan the wall of a fiery industrial furnace and indicate dangerous weak spots. It can examine a human leg and show a malfunctioning blood vessel that is causing varicose veins. Incredibly, it can even take a photograph of a past event.
This remarkable technique is called thermography, and it has given human beings a new way of seeing. Thermography depends upon the fact that all objects give off infrared energy. The strength of these infrared emissions depends on the temperature of the body from which they come. Although scientists have long been able to measure the strength of infrared emissions, the problem was to turn these measurements into some sort of "picture".
Attempts were not notably successful until 1965, when Dr. Ray Lawson, of Montreal, made the first thermograms of the human body. Progress in the science has been rapid ever since, as industrial companies in Europe and the United States have come up with new developments.
Today’s thermography looks, for the most part, like a small television camera. You point it at the subject, make a few fairly simple adjustments-and on an accompanying screen appear a black-and-white heat picture of the subject. Normally the warm areas are light, the cold areas dark, and the picture looks something like an ordinary photograph negative (底片). However, in some systems, black and white are reversed, and in still others the picture comes out in brilliant colors, with the various tones representing given temperatures.
Using one of these systems, experimenters made a picture of the past. Focusing on an empty chair after someone had been sitting in it for a few minutes; they were able to see the heat pattern left by the body, still emanating from the chair’s fabric. The picture was so clear that they could detect that the sitter’s legs had been crossed.
Thermography’s most valuable use has been in the field of medicine. Already it has helped to save lives, and added to doctors’ skills in treating disease. It has proved especially helpful in detecting breast tumors.
The standard examinations for breast cancer are mammography (X ray of the breast) and clinical examination. But, says Dr. Harold Izard, of Albert Einstein Medical Center in Philadelphia, who has used thermography to examine some 20,000 women for breast cancer, "The two methods do not catch everything. Thermography can indicate the possibility of some small cancers that have been missed. And it’s safe and cheap. We can do a thermogram in a couple of minutes, and although the machines cost around $30,000 each, the price of operating them is a mater of pennies. And with the addition of thermography to the other two methods, we can get about 92 percent accuracy in detecting breast cancer." [br] What does the word "emanating" in paragraph 5 mean?
选项
A、Coming forth
B、Belonging to
C、Flowing out of
D、Starting
答案
A
解析
选项A意思是“出现”,“涌现”;选项B译为“属于”;选项C意思是外流;选项D意思是“开始”。从而判定正确答案为A。
转载请注明原文地址:https://tihaiku.com/zcyy/3008112.html
相关试题推荐
Atfivefeet,itcanwarnofatumornobiggerthanapinprickdeepintheb
Atfivefeet,itcanwarnofatumornobiggerthanapinprickdeepintheb
Atfivefeet,itcanwarnofatumornobiggerthanapinprickdeepintheb
Atfivefeet,itcanwarnofatumornobiggerthanapinprickdeepintheb
Atfivefeet,itcanwarnofatumornobiggerthanapinprickdeepintheb
Formorethan10yearstherehasbeenabiggerriseincarcrimethaninmos
Formorethan10yearstherehasbeenabiggerriseincarcrimethaninmos
Formorethan10yearstherehasbeenabiggerriseincarcrimethaninmos
Formorethan10yearstherehasbeenabiggerriseincarcrimethaninmos
Formorethan10yearstherehasbeenabiggerriseincarcrimethaninmos
随机试题
Shedidnot______stayingathomeasshehadsomesewingtodo.A、matterB、careC、
Whichofthefollowingisnotacompoundword?A、blackboardB、greenhouseC、upgrad
Accordingtothenewsitem,theOccupymovementcondemnsthecountry’s______.[b
Inthebeginningofthemovie/,Robot,arobothastodecidewhomtosaveaf
【教学过程】 环节一:导入新课 复习导入。回顾上节课所学,交通运输方式对聚落的影响,思考在城市发展中与交通布局影响最大的人们的日常生活是什么,进而引出购
甲公司为一家在上海证券交易所上市的汽车零部件生产企业。近年来,由于内部管理粗放和
依据《公路工程集料试验规程》(JTGE42-2005),粗集料密度试验记录表如下
支气管肺炎区别于支气管炎的关键是()。A.咳嗽、气促 B.发热、频咳 C.呼
患者,女,55岁。因慢性支气管炎合并铜绿假单胞菌感染入院。患者高热、精神差、疲乏
下列儒家经典,不是由孔子编订、整理的是( )。A.《诗》 B.《书》 C.《
最新回复
(
0
)