fundamental reason
definitions
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The most basic, essential, or underlying cause or explanation for a situation, event, or belief.ja: 根本的な理由
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A primary principle or logical basis that serves as the foundation for a theory, argument, or system of thought.ja: 基本的な根拠
examples
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The fundamental reason for the company's failure was poor management.
その会社の失敗の根本的な理由は、経営不足でした。
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Justice is the fundamental reason behind our legal system.
正義は私たちの法体系の根本的な根拠です。