外皮

The crust of the bread is burnt.

这块面包外皮烤焦了。

Oil spotting (oleocellosis) was a prevalent physiological rind disorder of citrus fruits that was caused by the action of phytotoxic rind oils released from the oil cells in the flavedo.

摘要油斑病是发在柑橘果实上一种常见理性病害，是由于柑橘外皮组织中溢出橘油光毒性造。

The drug is collected in summer and autumn when the fruit turns greenish-yellow, boiled in water until the exocarp becomes grayish-white in colour, halved longitudinally, and dried in the sunn.

夏、秋二季果实绿黄时采收，置沸水中烫至外皮灰白色，对半纵剖，晒干。