2014年职称英语理工类教材学习部分内容及解析
1. Electric Backpack
(替换2013年用书理工类阅读理解第二篇:Will Quality Eat up the US Lead in Software? )
Backpacks are convenient. They can hold your books, your lunch, and a change of clothes, leaving your hands free to do other things. Someday, if you dont mind carrying a heavy load, your backpacks might also power your MP31 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 Philadelphia2 and the Marine Biological Laboratory in Woods Hole3, Mass. 4, have invented 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 5 receivers, night-vision goggles, and other battery-powered devices to get around and do their work.. The backpacks electricity-generating feature could dramatically reduce the amount of a wearers load now devoted to spare batteries, report Rome and his colleagues in the Sept. 9 Science6.
The backpacks electricity-creating powers depend on springs used to hang a cloth pack from its metal frame. The frame sits against the wearers 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 packs 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 arent on the market yet, but if you do get one eventually, just make sure to look both ways before crossing the street!
词汇:
backpack n.背包
watt n. 瓦(特)
receiver n. 接收机
gait n. 步态,步法
night-vision goggle 夜视镜
oscillation n. 摆动
spring n. 弹簧
commercialize v. 商业化
vertical adj. 垂直的
mountaineer n. 登山运动员
rotary adj. 旋转的
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Nothing ventured nothing gained课件1
七年级英语下册第一次月考试题13
People on the move课件3
Nothing ventured nothing gained课件2
Protecting ourselves课件4
Making a happiness handbook课件5
七年级英语下册第一次月考试题10
People on the move课件6
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Making a happiness handbook课件6
Learning efficiently课件1
People on the move课件5
Making a happiness handbook课件9
Law and order课件7
Making a happiness handbook课件10
七年级英语下册第一次月考试题14
Learning efficiently课件3
七年级英语下册6月月考试题
Fit for life课件3
七年级英语下册第一次月考试题11
Putting on a play课件1
七年级英语下册月清检测试题
Making a happiness handbook课件8
Making a happiness handbook课件3
Fit for life课件2
Nothing ventured nothing gained课件3
Fit for life课件1
People on the move课件1
Protecting ourselves课件8
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