欢迎来到天天文库
浏览记录
ID:8394337
大小:28.00 KB
页数:2页
时间:2018-03-25
《2015年职称英语卫生b级原文出处(补全短文)精选》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、2015年职称英语卫生B级原文出处(补全短文) 第八篇LungCancer 1 Thedeathrateduetocancerofthelungshasincreasedmorethan800percentinmalesandhasmorethandoubledinfemalesduringthelast25years.Itisconsiderablyhigherinurbanandindustrialareasthaninruraldistricts.Therearemanypossiblecau
2、ses,butitisstillcontroversialwhicharemostblameworthy.Thosefactorswhichhavebeenmentionedmostfrequentlyarethepresenceofforeignparticlesandotherirritantsintheair(smokeparticles,smog,exhaustfumes),andthesmokingofcigarettesandcigars. 2 Numerousstudieshavedem
3、onstratedastrikingcorrelationbetweenthedeathratefromlungcancerandsmokinghabits.Amongheavysmokers—21to30cigarettesperday—themortalityratefromlungcancerisnearly17timestheratefromnonsmokers.Itisexpectedthedeathrateamongwomenwillincreaseasthepresenthighrateo
4、fsmokingamongwomenhasitseffect. 3 Sometimescasesoflungcancerarediscoveredatthetimeanx-rayistakenforthepurposeofdetectingtuberculosis.Toooften,however,acurrentemphasisuponthedangerofexposuretoradiation1fromX-raymachinescanfrightenpeopleawayfromroutineche
5、stX-raysandthuspreventanearlydiagnosisoflungcancer.Earlydetectionisabsolutelyessentialifanypossibilityofcureistobemaintained2.ModernX-raymachinesincompetenthandsposesuchslightdanger,atleasttothoseover40yearsofage,thatthiswouldbemuchmorethanoffsetbytheadv
6、antagesofdiscoveringatumorwhileitissmallenoughtobecompletelyremoved.3 4 Acommonformoflungcancerisbronchogeniccarcinoma4,so-calledbecausethemalignancyoriginatesin5abronchus.Thetumormaygrowuntilthebronchusisblocked,cuttingoff6thesupplyofairtothatlung.Thel
7、ungthencollapses,andthesecretionstrappedinthelungspacesbecomeinfected,witharesultingpneumoniaortheformationofalungabscess.Suchalungcancercanalsospreadtocausesecondarygrowthsinthelymphnodes7ofthechestandneckaswellasinthebrainandotherpartsofthebody.Theonly
8、treatmentthatoffersapossibilityofcure,beforesecondarygrowthshavehadtimetoform,istoremovethelungcompletely.Thisoperationiscalledpneumonectomy. 5 Malignanttumorsofthestomach,thebreast,theprostategland8andotherorgansmaysprea
此文档下载收益归作者所有