solid foundation
definitions
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A strong, stable, and well-constructed physical base upon which a structure, such as a building or monument, is built.ja: 堅固な基礎
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A strong, reliable, or well-established basis, principle, or set of facts that supports an idea, relationship, organization, or concept.ja: 確かな基盤
examples
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The engineers ensured the skyscraper was built on a solid foundation to prevent tilting.
エンジニアは、傾斜を防ぐために、超高層ビルが堅固な基礎の上に建てられていることを確認した。
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Learning basic grammar provides a solid foundation for mastering a new language.
基本的な文法を学ぶことは、新しい言語を習得するための確かな基盤となります。