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Hello, my name is [Your Name]. Today I will talk about waves. There are two main types of waves transverse waves, where the vibration is perpendicular to the direction of travel, like water waves,

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Sound of waves -Sơn and Thanh- 7 Pisa

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Di and Han team

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Hellooooooooo

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hello

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pham phong and Hien Minh

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I spedup 'cause the videos was too long