crusts
[krʌst]
[ crusts ]
n.外壳, 坚硬的外壳, 面包皮
vt.盖以硬皮
vi.结硬皮
例句与用法：
The earth's crust is layered..
地球的外壳是分层的。
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。
The snow crusted the lake last night.
昨夜的雪使湖面结了冰。
词形变化：
形容词: crustless | 动词过去式: crusted | 动词过去分词: crusted | 动词现在分词: crusting | 动词第三人称单数: crusts |