[统计] 人口密度与城市

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This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Do you come from a country that has, let's say, a history of environmental disasters or conquests? Then your culture is probably tightit has strong soc

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delicate a.巧妙的，优雅的；精致的，微妙的 delicious a.美味可口的；芬芳的；有趣味的，妙的 delight n.欣喜，愉快；嗜好 vt.(使)喜悦 deliver vt.救出；投递 delivery n.投递，送交；交付，交货；分娩

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2006年VOA标准英语（三月）

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Ever wander through a supermarket and past the open refrigerated cases that house cream cheese, butter and OJ? The refrigerated shelves are protected by jets of air that blow across the front. These jets form an air shield to keep the warm air out. T

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