Last Updated:2025/11/19

The mason carefully fitted the keystone into the arch, knowing it would lock the other stones in place.

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The mason carefully fitted the keystone into the arch, knowing it would lock the other stones in place.

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石工はアーチの鍵石を慎重にはめ込み、それが他の石をしっかりと固定することを知っていた。

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