at heart
本質上的
A:Ben always appears rude to the people around him.
A: 本總是以周圍的人表現得很無禮。
B: But he's really kind at heart.
B:可他事實上是個很善良的人。
A: That's true. We can't judge people by appearance.
A:是的,我們不能從外表來判斷人。