A hard outside coating or rind.

硬外皮；壳。

The exterior solid part of the earth's surface.

地壳。

A shell or hard covering, as on a loaf of bread.

硬的外皮或外壳(如面包皮)。

The pastry casing of a pie.

面饼之外皮。

A hard coating deposited by wine on the interior of bottles.

(酒等的)酒垢。

Insolence; gall.

【俚】粗野；厚颜无耻。

To cover over with a hard covering.

用外皮覆盖。

To become so covered.

结成硬皮。