crust
[krʌst]
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 |
详细释义：
n.
1. 面包皮; 干面包片; 馅饼皮[C][U]
2. 硬外皮, 外壳; 冰面; 雪壳[C][U]
3. 地壳[the S]
The earth's crust is between 5 and 25 miles thick.
地壳有五至二十五英里厚。
4. 【动】甲壳[C][U]
5. 【医】痂[C][U]
6. 【俚】厚颜, 无礼[the S]
He had the crust to ask to borrow my new car!
他竟有脸向我借新汽车!
vt.
用硬皮覆盖; 在……上结硬皮
Ice crusted the stream.
小溪上结了一层冰。
vi.
结成外壳; 覆有硬皮
The snow crusted over.
雪结成一层冰。