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What is ECHO? 🗣 Smile and Learn 🔊

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What is ECHO? 🗣 Smile and Learn 🔊

Have you ever heard of echo? Echo is an acoustic phenomenon that occurs when a sound wave hits an obstacle and is reflected back to us, causing us to hear the sound a little later than normal and repeatedly. Thanks for visiting us! If you want your children to smile and learn, subscribe! :D If you like our videos, download Smile and Learn now ...

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