单词：Shapley, Harlow
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John Quincy Adams, a Man Raised to Serve His Country 一个毕生都在服务他的国家的人 - 约翰昆西亚当斯 From VOA Learning English, welcome to The Making of a Nation, our weekly program of American history for people learning English.
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Welcome to This I believe, an NPR series presenting the personal philosophies of remarkable men and women from all walks of life. I believe in honor, faith and service I believe that a little outrage can take you a long way. I believe in freedom of s
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But if you look carefully, stars aren't spread smoothly across the whole sky. They are gathered together into a band that loops around the sky which we call the Milky Way. That bright strip across the sky with its extraordinary abundance of stars and
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