using aluminium foil to sharpen an already sharp knife.
母のすごい技 - アルミホイルの使い方 - 包丁をカミソリのように鋭く研ぐ
Just Sharpen The Knife With A Foil/High Level Inventions#amazing
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マグカップだけを使用してナイフをかみそりの鋭さに研ぎます
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