crust

释义

n. 外壳,坚硬的外壳,面包皮
v. 盖以硬皮,结硬皮

例句

1. The snow crusted the lake last night.
   昨夜的雪使湖面结了冰。
2. The crust on the snow was thick enough for us to walk on it.
   外层的雪已经冻硬，可以在上面行走。