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ElectricBackpack Lawrence C. Rome and his colleagues from the University of Pennsylvania in Philadelphia2 and the Marine Biological Laboratory in WoodsHole3，Mass.4，have invented a backpack that makes electricity from energyproduced while its wearer walks. In military actions，search-and-rescueoperations，and scientific field studies，people rely increasingly on cellphones，global positioning system 5 receivers，night-vision goggles，andother battery powered devices to get around and do their work. The backpackselectricity- generating feature could dramatically reduce the amount of awearers load now devoted to spare batteries，report Rome and his colleagues inthe Sept.9 Science6. Unexpectedly，tests showedthat wearers of the new backpack alter their gaits in response to the packsoscillations，so that they carry loads more comfortably and with less effortthan they do ordinary backpacks. Because of that surprising advantage，Rome plans to commercialize both electric and non-electric versionsof the backpack. 词汇:5bAkpAkwCt p receivern.接收机 gaitn.步态，步法7Csi5leiFEnp springn.弹簧 commercializev.商业化5vE:tikEl 7maunti5niEp rotaryadj.旋转的 1. Backpacks are convenient because B they can hold as many things as you want to carry. D you do not have to carry things withyou. | 
