单词：fluted roller shaft
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DAVID GREENE, HOST: Today the Middle Eastern country of Lebanon is relatively peaceful, though a civil war raged there in the '70s and '80s. Often Lebanese people don't like to talk about what happened. NPR's Alice Fordham meets a woman trying to sta
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He gets on the roller coaster. His mom sits next to him. This is his first roller coaster ride. The roller coaster starts up. It is fast. It goes up and down. It goes around and around. He looks at his mom. His mom looks at him. They both laugh. The
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You don't have to be a champagne buff to want the best flavor from your bubbly. So the secret to a perfect glass? It's all in the pour, according to a study in the Journal of Agricultural and Food Chemistry. A key player in champagne's taste is its d
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This is Scientific American's 60-Second Science. I'm Christopher Intagliata. Got a minute? You don't have to be a champagne buff to want the best flavor from your bubbly. So the secret to a perfect glass? It's all in the pour, according to a study in
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Recent discoveries in New World archaeology along with newscientific methods for analyzing data have led to new ideas regarding theorigin of the first peoples of the Americas and their time of arrival. 新大陆考古发现和新的科学方法 The t
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