Level 1 lesson 14 (the pronunciation of [ɔɪ] and [aʊ]) / 第1单元第14课(音标[ɔɪ]和[aʊ])

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Level 1 lesson 14 (the pronunciation of [ɔɪ] and [aʊ]) / 第1单元第14课(音标[ɔɪ]和[aʊ])

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