最終更新日：2025/12/04
The bell-maker selected hard metal for the bell's body, trusting that the alloy's composition — two parts copper to one of tin — would produce the ringing tone and strength he needed.
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The bell-maker selected hard metal for the bell's body, trusting that the alloy's composition — two parts copper to one of tin — would produce the ringing tone and strength he needed.
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