3N-UNCOUNT 树皮Bark is the tough material that covers the outside of a tree. 树皮
4PHRASE 刀子嘴,豆腐心;冷面孔,菩萨心 If you say that someone's bark is worse than their bite, you mean that they seem much more unpleasant or hostile than they really are. 刀子嘴,豆腐心;冷面孔,菩萨心 [informal]
She can be a bit tetchy but her bark is worse than her bite.