trace to its cause ; find out its cause
写作，究其根本，就是一种沟通的方式。
At its most basic, writing is a way of communicating.
youdao
究其根本，选择就在于此。
Ultimately, that's the choice.
语言，究其根本，是一种活生生的、不断演变的社会元素。
Language, by its nature, is a living, ever-changing force in society.
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