单词：low-alloy high-strength steel
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material scientists admire spider silk for being lightweight and strong.now another arthropod product is getting into the act insect cuticle,the tough flexible material is inside insect skeleton.researchers at harvard * institute for biological inspi
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图片1 enemy n. 敌人，敌军 adj. 敌人的，敌方的 例句：After several fails the enemy was forced to retreat. 几经失败之后，敌军被迫后撤。 rival n. 竞争者 对手 v. 竞争，对抗 ，相匹敌 例句：After the national
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It's the best place in Wenatchee, I said to my husband, as I described the new Pybus Market. This all-year-round(1) shopping center and farmer's market is the latest addition(2) to Wenatchee. It is a real step forward for this town which, up until no
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379 、 石棉 asbestos;asbestus 380 、 石膏 PlasterofParis 381 、 示波器 oscilloscope 382 、 立体图 pictorialdrawing 383 、 交流电流 alternatingcurrent(a.c.) 384 、 交流电压 a.c.
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Obama Touts US Manufacturing Gains 奥巴马吹捧美国制造业就业增长 BALTIMORE From lowering unemployment to boosting manufacturing, President Barack Obama is expected to tout gains in the U.S. economy during his State of the Union address o
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STEVE INSKEEP, HOST: There is a big divide between older Americans who are ready for retirement and those who don't quite have the money. Our colleague Marilyn Geewax retired from her post as an NPR business editor, and then she attended her 45th hig
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