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Crash Course (Philosophy #16)、科普: 風水石球、數學好好玩、地理、高中化學(常見的化學反應三)
Existentialism: Crash Course Philosophy #16
https://www.youtube.com/watch?v=YaDvRdLMkHs
不可思议的“风水石球”，重达29吨，为什么能在水上漂浮着旋转？
https://www.youtube.com/watch?v=0PiES0SjuwU
2015.12.19【民視異言堂】數學好好玩
https://www.youtube.com/watch?v=PecQkykU6Fc
Can the 'Great Green Wall' stop desertification in China?
https://www.youtube.com/watch?v=pSn6S-H7m-8
Do Now 3.26.21 (#21 of Mastering)
https://www.youtube.com/watch?v=-jq0O9JDeio
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