Level 2 lesson 20 (the pronunciation of [f]、[v]、[s]、[z]) / 第2单元第20课(音标[f]、[v]、[s]、[z])

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Level 2 lesson 20 (the pronunciation of [f]、[v]、[s]、[z]) / 第2单元第20课(音标[f]、[v]、[s]、[z])

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