学习必备欢迎下载Unit2AAmericaisexperiencingamajorepidemictoday
现今美国正在经历一场重要的流行病
Unlikeepidemicsofthepast,itisnotadiseasetransmittedbybacteriaorviruses
不同于过去的流行病,它不是由细菌或病毒传染的疾病
Thisepidemicisanincreaseindiseasesandproblemsrelatedtostress,andittouchesallofourlives
这个流行病的增加是与压力有关的疾病和问题引起的,它涉及我们生活的方方面面
In1900theaveragelifeexpectancyinthiscountrywas47,andthemajorkillerdiseasesincludedtuberculosispneumonia,influenza,cholera,typhoid,andsmallpox——infectiousdiseaseswhichstruckpeopleofallages,regardlessoftheirlifestyle
1900年,这个国家的平均预期寿命为47岁,其主要致命疾病包括肺结核肺炎,流行性感冒,霍乱,伤寒,天花-这些传染性疾病袭击了所有年龄层的人,不管他们的生活方式怎样
Today,ontheotherhand,lifeexpectancyhasbeenextendedto74,thanksinlargeparttotheconquestoftheacuteinfectiousdiseasethroughimprovedsanitation,betterdistributionandstorageoffoods,andtheintroductionofimmunizationandan