fundamental reason
definitions
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The most basic, essential, or underlying cause or explanation for a situation, event, or belief.zh: 基本原因
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A primary principle or logical basis that serves as the foundation for a theory, argument, or system of thought.zh: 基本原理
examples
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The fundamental reason for the company's failure was poor management.
公司失败的基本原因是管理不善。
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Justice is the fundamental reason behind our legal system.
正义是我们法律制度的基本原理。