Definitions

[1] n. 外壳, 坚硬外皮, 面包皮

[2] vt. 盖以硬皮

[3] vi. 结硬皮

[4] [医] 痂; 壳

[ krʌst ]

1. There's a skeleton choking on a crust of bread.
   一尊骷髅被硬面包噎到。
2. The snow lay on the ground, frozen into a thick, hard crust.
   地上覆盖着积雪，冻成了又硬又厚的壳。
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