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贝尔专利

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A warm, simple introduction to the telephone for kids. Learn how Bell's curiosity led to the first call, meet other inventors, and try a playful paper-cup activity to show how sound travels. STEAM

儿童电话历史：声音与发明的小奇迹

一个温暖、简单的儿童电话介绍。了解贝尔的…

Roshni Sawhny

Roshni Sawhny

20 5 月, 2026 •
1 分钟阅读

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