单词:structural assembly
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This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Airplane manufacturers have been changing over from aluminum to advanced composite materials. These lighter, stronger composites are made of fibers of
A report in the journal Science announces the finding of the oldest known human-fashioned threads, left in a cave by the Caucasus mountains about 34,000 years ago. Cynthia Graber reports. We humans love to decorate things. We wear flashy clothes, ti
肌肉生而不等 Don:Its not fair! Yal: Whats not fair? D: I was rereading the Constitution of the United States. It says here that All people are created equal.Thats just not true! Y:What do you mean? D: Well, its always being my dream to become t
The Color of Lint 绒线的颜色 You go to the local laundromat to do your wash.In the spinning barrel full of sudsy water you load clothes of all colors: a bright red tee-shirt, blue jeans, a green bandanna. The original mix of clothing is as multi
The Parts of Metabolism 新陈代谢到底是什么? What is metabolism really? Statements like he can eat a lot because he has a fast metabolism are somewhat misleading. Metabolism isnt about the digestion of food in your stomach; its the name giv
Hey! and thenOuch! 伤害性刺激作用于末梢神经引起神经兴奋电活动,沿着脊髓传人神经纤维中的细纤维(A和c纤维)传人脊髓,进而引起痛觉。痛觉是由于痛觉感受器受刺激而诱发的,其他感受器受到