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duolingo考试全解析之“什么是Duolingo”
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什么是Duolingo？ ① 多邻国（Duolingo） 是一款语言学习工具软件，由联合创始人路易斯·冯·安和赛维林·海克在美国匹兹堡创立。 ② 多邻国提供40种语言课程， 包括英…