单词：estimates of means over subpopulation
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This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. If you want to guess how many jelly beans are in a jar, you should ask your friends. Then average their answers. Because a group guess is often more accu
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HOST: Welcome to AMERICAN MOSAIC, in VOA Special English. (MUSIC) I'm Doug Johnson. On our show this week: We answer a question about popular American states... Play some music recorded to help women in Darfur, Sudan... And report about a little girl
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AS IT IS 2014-09-24 Experts: Population to Grow from 7 to 11 Billion 专家预测人口或从70亿增长到110亿 Our planet is home to about seven billion people. Since the 1990s, population experts have predicted the number would grow to nine billi
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DEVELOPMENT REPORT - U.N. World Population Report By Nancy Steinbach Broadcast: Monday, March 07, 2005 I'm Gwen Outen with the VOA Special English Development Report. A United Nations report says the
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DEVELOPMENT REPORT - U.N. World Population Report By Nancy Steinbach Broadcast: Monday, March 07, 2005 I'm Gwen Outen with the VOA Special English Development Report. A United Nations report says the
农业与发展