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					Obstacles are everywhere disappearing. 出自-2013年12月阅读原文
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					Milkman, the sociologist, argues that American craftsmanship isn't disappearing as quickly as some would argue - that it has instead shifted to immigrants. 出自-2013年6月阅读原文
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					They're disappearing fast in America. 出自-2010年12月听力原文
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					But the barriers are disappearing, in part because journals and funding agencies worldwide are encouraging scientists to make their data public. 2017年6月六级真题(第一套)阅读 Section C
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					Small communities, with their distinctive character—where life is stable and intensely human—are disappearing. 2016年12月六级真题(第三套)阅读 Section A
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					Today's demographics show that the middle class is disappearing and now the richest one percent of the population has amassed more wealth than the bottom 90 percent. 2018年12月六级真题(第一套)听力 Section C