Tại Sao Bảng Trắng Luôn Bẩn?


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Ngày đăng: 05/08/2016

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If you have an old, well-used whiteboard in your classroom, you might
see something a little strange -- ghosts! But not the spooky, bust-able
kind... these are the ghosts of lectures past! Hosted by: Hank Green
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