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Tomokazu Ihara

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Podcast??????????????????????????”????”?????????????Youtube??????????https://www.youtube.com/playlist?list=PLN79YptW7uy7QN30peqp-u6J52Jxdrujg

?????????????????????????????????????????? (Wikipedia??) Quicksand is a colloid hydrogel consisting of fine granular material (such as sand, silt or clay), and water. (From...

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