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Warning: Trying to access array offset on value of type bool in /home/kkwave/patsukin.com/public_html/wp-content/themes/simplicity2/header-twitter-card.php on line 45 4大原理が不明な物 「麻酔は何故効くのか」「飛行機は何故飛ぶのか」「セメントは何故固まるのか」あとひとつは何？