英语翻译Electric BackpackBackpacks are convenient.They can hold

英语翻译
Electric Backpack
Backpacks are convenient.They can hold your lunch,and a change of clothes,leaving your hands free to do other things.Someday,if you don’t mind carrying a heavy load,your backpacks might also power your MP3 player,keep your cell phone running,and maybe even light your way home.
Lawrence C.Rome and his colleagues from the University of Pennsylvania in Philadelphia and the Marine Biological Laboratory in Woods Hole,Mass.,have inverted a backpack that makes electricity from energy produced while its wearer walks.In military actions,search-and-rescue operations,and scientific field studies,people rely increasingly on cell phones,global positioning system (GPS) receivers,night-vision goggles,and other battery-powered devices to get around and do their work.The backpack’s electricity-generating feature could dramatically reduce the amount of a wearer’s load now devoted to spare batteries,report Rome and his colleagues in the Sept.9 Science.
The backpack’s electricity-creating powers depend on springs used to hang a cloth pack from its metal frame.The frame sits against the wearer’s back,and the whole pack moves up and down as the person walks.A gear mechanism converts vertical movements of the pack to rotary motions of an electrical generator,producing up to 7.4 watts.
Unexpectedly,tests showed that wearers of the new backpack alter their gaits in response to the pack’s oscillations,so that they carry loads more comfortably and with less effort than they do ordinary backpacks.Because of that surprising advantage,Rome plans to commercialize both electric and non-electric versions of the backpack.
The backpack could be especially useful for soldiers,scientists,mountaineers,and emergency workers who typically carry heavy backpacks.For the rest of us,power-generating backpacks could make it possible to walk,play video games,watch TV,and listen to music,all at the same time.Electricity-generating packs aren’t on the market yet,but if you do get one eventually,just make sure to look both ways before crossing the street!

发电背包.
背包很方便,你能用它们装午餐还有换洗的衣服,于是你的手得以解放去做其他的事情.如果将来,你不介意背着很重的行李,你的背包还可能为你的mp3供电,保证你的手机运行甚至可能在你回家的路上提供照明.
Lawrence C. Rome和他的同事们（来自费城的宾夕法尼亚大学和麻省理工的伍兹霍尔海洋生物实验室）发明了一种通过利用携带者走路而产生电能的背包.在军事行动,搜寻援救行动以及科学领域研究当中,人们越来越多地依靠手机,全球定位系统接收终端,夜视镜以及其他电池供电设备来展开工作.Lawrence C. Rome以及他的同事们在九月份的《科学》周刊上表示,背包能够发电这一功能,因为省去了电池的携带,可以显著的减轻背包人员的负重.
背包的电能是依靠嵌在铁架上的弹簧产生的,这组弹簧挂住背包,铁架负在使用者的背后,当人行走时,整个背包就会上下晃动.一个杠杆机构将这种垂直运动转化为电机的旋转运动,最大功率达7.4瓦.
实验意外地发现,这种新型背包的使用者因背包的晃动会调整自己的步伐,使得他们携带这些负载时,会比使用普通背包更舒服,更省力.看到这个巨大的优势,Rome计划以有电和无电两种版本对这种背包进行商业化运作.
这种背包最适用于士兵,科学研究人员,登山者和紧急救护人员等高负重的典型人群.而对于我们其他人,发电背包则使散步,完视频游戏,看电视和听音乐能够在同一时间进行.发电背包如今还未上市,不过如果你后来拥有了一款,过马路的时候一定要先向左右看看（以免沉迷于视频游戏而出了车祸,典型的西式幽默.）.