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銅が身を守るための手段がなんと美しいことか。
What a beautiful way for copper to protect itself.
今回は身近に手に入る銅として10円玉を塩化アンモニウムに何度か続けて点滴し続けました。
This time, I continued to drip a 10-yen coin into ammonium chloride several times in a row as copper, which was readily available.
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