crust

1.[c][u]面包皮the hard outer surface of bread

2.[c][ususing]糕饼（尤指馅饼）酥皮a layer of pastry , especially on top of a pie

3.[c][u]（尤指软物或液体上面、周围的）硬层，硬表面a hard layer or surface, especially above or around sth soft or liquid

1.用外皮覆盖;结成硬皮;生痂儿;形成硬壳

1.外皮,壳;〔美国〕雪壳;【地质学;地理学】地壳;【动物;动物学】甲壳;【医学】痂;(酒等的)浮渣;水垢

2.(事物的)皮相,外表,表面

3.〔美俚〕老面皮,厚颜无耻,没礼貌;(人的)脑壳

4.面包的外皮

5.沉积层

6.垢物

7.结皮层

1.to form into a crust

2.to cover something with a crust or become covered with a crust

1.the thin, usually hard or crisp outer part of a loaf or slice of bread

2.a piece of bread that is mostly crust or is stale and dry

3.the pastry that wholly or partly encases a pie or tart

4.a crisp, hard, or thick outer layer or coating that develops on something

5.the thin outermost layer of Earth, approximately one percent of Earth's volume, that varies in thickness and has a different composition from the interior.

6.a dry hardened outer layer of blood, pus, or other bodily secretion that forms over a cut or sore

7.a thin layer of potassium tartrate that forms on the inside of some wine and port bottles as the contents mature

8.the hard outermost body covering in some living organisms, such as lichens and crustaceans

9.a layer of cooked pastry that forms the outer part of a pie. The inner part is called the filling.

10.the thick outer surface of the Earth or another planet

11.a hard layer of a substance covering a softer substance or a liquid