讲解文本：

at heart （人） 本质上，实际上，内心里
He seems strict but he’s a very kind man at heart.
他好像很严格，但内心里是很和蔼的。
Mike doesn't like his accounting job because he's an artist at heart.
麦克其实并不喜欢他会计的工作，因为他内心里是个艺术家。

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