粵語旁白
Cantonese narration 這裏有一個籃球和一個網球。
Here are a basketball and a tennis ball. 把網球放在籃球上,然後舉起。
Place the tennis ball on the basketball and raise them together. 放下籃球,觀察發生甚麼事。
Release the basketball. What will happen? 網球被彈至空中。
The tennis ball is bounced up into the air. 為甚麼?
Do you know why?

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Dennis Veasley

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