单词学习：crusty 形容词
crusty
/ˈkrʌsti/
1. 有硬壳的；外壳坚硬的 2. （人）脾气暴躁的，易怒的
Mr. Gu, the crusty but kind-hearted teacher, always had a fresh loaf of crusty bread on his desk.
脾气暴躁但心地善良的顾老师，桌上总是放着一块新鲜的硬皮面包。
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