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springer /ˈspɹɪŋmˈɛtəl ˌɪnsjuːlˈeɪʃən/ n

中文：拱脚石

中文 · 拱脚石Español · salmerFrançais · sommier
Meaning：Stone that constitutes the arch’s first voussoir and is placed on top of the pier.
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Found in these illustrated scenes（1）

Round arch

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