n.面包皮；外壳；硬外皮；地壳vt.用外皮覆盖；在…上结硬皮；生痂儿；vi.结成外壳；结硬皮； 变形： 复数：crusts过去式：crusted过去分词：crusted现在分词：crusting第三人称单数：crusts 双语释义：n.(名词)[C][U]面包皮; 糕饼等的酥皮 hard outer surface of a loaf of bread; pastry covering of a pie, tart, etc.[C][U](泥土、雪等)硬的外层 a hard outer covering,