单词：Hall-effect generator
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[00:04.00]flight [00:06.22]n.飞翔，飞行；航班；航程；楼梯的一段 [2]逃跑，溃退 [00:08.44]fling float flock [00:11.62]vt.(用力地)扔,抛,丢 v./n.漂浮,浮动 n.(禽,畜等的)群;大量v.群集,成群 [00:14.81]flood floor [0
考研英语词汇2005
fruitful a.多产的；有成效的 frustrate vt.破坏，阻挠；使失败，使泄气 fry v.油煎，油炸 fuel n.燃料；养料 v.(给)加燃料；刺激；推动 fulfil vt.履行(诺言等)；完成(计划等)；达到 fulfill vt.履行(诺言、
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Bladeless Wind Generator Safe for Birds Wind turbines are tall structures with large blades used to produce electricity. They are useful sources of low-cost, renewable energy. But they can also be deadly to birds and bats. The turbines large blades t
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RAY SUAREZ, HOST: After Harvey and Irma, the hurricane season wasn't over. Hurricane Maria made landfall on Puerto Rico as a massive Category 4 storm. Months later, the power supply is still spotty, and thousands of homes still rely on generators. Da
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JUDY WOODRUFF: Next: the possibilities of getting more energy through water. Humans have long harnessed the power of water to perform work. In modern time, hydroelectricity, generated by the power of water flowing through turbines at the base of dams
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Now Minneapolis-based inventor Rich Kronfield has created an electric-assist 'Raht Racer' velomobile that he claims can travel at up to 100mph (160km/h). 现在美国明尼阿波利斯的发明家里奇?科伦菲尔德研制了电动拉特赛车（Ra
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