"to the core" in Chinese (Simplified)
彻底地从内到外
Definition
形容某人内心深处的品质或信仰，或某事非常影响某人。
Usage Notes (Chinese (Simplified))
通常跟在名词或形容词后（如“忠诚彻底地”）。强调彻底或极端的程度。属于英语习语，不能逐字翻译。
Examples
She is honest to the core.
她**彻底**诚实。
He is loyal to the core.
他**从内到外**忠诚。
The news shook her to the core.
这个消息让她**彻底**震惊。
He’s a city boy to the core, never wanted to live in the countryside.
他是个**彻底的**城市男孩，从没想过住在乡下。
She’s a perfectionist to the core, nothing less than perfect will do.
她是个**彻底的**完美主义者，无法接受不完美。
The betrayal hurt him to the core, and he found it hard to trust again.
背叛让他**从内到外**受伤，很难再相信别人。