File:《國語留聲片課本》上聲變調.jpg
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![File:《國語留聲片課本》上聲變調.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/7/7d/%E3%80%8A%E5%9C%8B%E8%AA%9E%E7%95%99%E8%81%B2%E7%89%87%E8%AA%B2%E6%9C%AC%E3%80%8B%E4%B8%8A%E8%81%B2%E8%AE%8A%E8%AA%BF.jpg/725px-%E3%80%8A%E5%9C%8B%E8%AA%9E%E7%95%99%E8%81%B2%E7%89%87%E8%AA%B2%E6%9C%AC%E3%80%8B%E4%B8%8A%E8%81%B2%E8%AE%8A%E8%AA%BF.jpg?20181230095716)
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