crust

名词 crust:

1. the outer layer of the Earth
   同义词：Earth's crust
2. a hard outer layer that covers something
   同义词：incrustation, encrustation
3. the trait of being rude and impertinent; inclined to take liberties
   同义词：gall, impertinence, impudence, insolence, cheekiness, freshness

动词 crust:

1. form a crust or form into a crust

1. The earth's crust is layered..
   地球的外壳是分层的。
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。
3. The snow crusted the lake last night.
   昨夜的雪使湖面结了冰。

crust

n.（名词）

The hard outer portion or surface area of bread.
面包皮：面包的表面区域的硬皮
A piece of bread consisting mostly of the hard outer portion.
硬面包片：主要由外表硬皮构成的面包片
A piece of bread that has become hard and dry.
干面包片：变硬变干的面包片
A pastry shell, as of a pie or tart.
馅饼皮：馅饼或果馅饼等的面团的外壳
A hard, crisp covering or surface:
坚硬表面：硬的、脆的外皮或外壳：
例句：
snow with a firm crust.
有一层坚硬冰面的雪

A hard deposit formed on the interior of a wine bottle as the wine matures.
酒垢：酒酿熟后在酒瓶内部生成的硬的沉积物
Geology
【地质学】
The exterior portion of the earth that lies above the Mohoroviôiô discontinuity.
地壳：位于莫霍洛维奇契不连续面之上的地球外层
The outermost solid layer of a planet or moon.
外壳：行星或月亮最外面的固态层
The hard outer covering or integument of certain plants and animals, such as lichens and crustaceans.
甲壳：某些植物或动物的硬的外层覆盖物或包裹物，如地衣和甲壳纲动物
Pathology An outer layer or coating formed by the drying of a bodily exudate such as pus or blood; a scab.
【病理学】 痂：由身体的渗出液如浓液或血液等变干而形成的一层外皮或覆盖物；痂
Informal Insolence; audacity; gall.
【非正式用语】 无礼；放肆；厚颜无耻
v.（动词）
crust.ed,crust.ing,crusts
v.tr.（及物动词）
To cover with a crust.
用硬皮覆盖
To form into a crust.
在…上结硬皮
v.intr.（不及物动词）
To become covered with a crust.
有外壳，有硬皮：变得覆有外壳，硬皮
To harden into a crust.
结硬皮：变硬结成硬皮

来源：
Middle English cruste
中古英语 cruste
from Old French crouste
源自 古法语 crouste
from Latin crusta * see kreus-
源自 拉丁语 crusta *参见 kreus-

【引伸】
crust.less
adj.（形容词）