声表面波换能器

Windows Vex Bats' Echolocating Abilities 干扰蝙蝠回声定位的烦人窗 Just as humans understand the shape of our surroundings by how light reflects off objects, bats use reflections of sounds they produce insteadwhats called echolocation. But

发表于:2018-12-02 / 阅读(65) / 评论(0) 分类 2017年Scientific American(九)月

Jack plunched down into thesea, the water was freezing cold, hepumped back up to the surface, choaking and coughing, the lifevest kept Jack closed, but the waves kept hammering at him. Help! Jack shouted. Thought to the twenty foot tiger shark, andmy

发表于:2018-12-10 / 阅读(66) / 评论(0) 分类 汪培珽儿童英文分级书单《神奇树屋》

By Liu Enming San Francisco, California 04 September 2007 Pipe picks up sounds created by waves At the tip of a tiny peninsula near San Francisco, California's Golden Gate Bridge stands the Wave Organ, a work of art that allows people to listen to mu

发表于:2019-01-20 / 阅读(94) / 评论(0) 分类 2007年VOA标准英语(九月)

Science and Technology Three-dimensional printing An image of the future 科技 3D印刷 印刷未来 One of the biggest manufacturers in the world gives 3D printing a go 世界龙头机器制造商用3D印刷术进行了一次格外成功的应用 U

发表于:2019-01-26 / 阅读(66) / 评论(0) 分类 经济学人科技系列

Just as humans understand the shape of oursurroundings by how light reflects off objects, batsuse reflections of sounds they produce insteadwhat's called echolocation. But despite theirexcellent sensing abilities, one type of obstaclevexes the animal

发表于:2019-02-14 / 阅读(38) / 评论(0) 分类 2018年科学美国人1月

Those waves hitting the sand actually begin far out at sea. And it doesnt take much to get them going. A little wind will do the trick. First the wind blows over the surface of the water, generating the little ripples you can see just by blowing acro

发表于:2019-02-23 / 阅读(46) / 评论(0) 分类 英语时差8,16
学英语单词
a sap
agreement on government procurement
alnus rugosas
amplitude comparator
amynthas tessellatus paucus
bashi -bazouk
be reduced to ashes
board room
bronze weight
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cardioplasty
carotidocavernous
Cassegrainian reflecting telescope
cat's eye
chemotherapeutant
chronic passive congestion of liver
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correct me if I'm wrong
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Infiltrase
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launch(ing) aircraft
less-developed
light-splitting optical system
line triggering
machineshop
market higher
mclanathan
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methylsulfonylmethane
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milija
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nov(o)-
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on the rolls of fame
oscillatory burning
otic placode
paeonia suffruticosaandr. ?
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