B1 [ C or U ] the natural outer layer that covers a person, animal, fruit, etc.皮肤；皮

B1 [ C or U ] the skin of an animal that has been removed from the body, with or without the hair or fur被剥下的（带或不带毛发的）兽皮

[ C or U ] any outer covering外壳

[ S ] a thin surface that forms on some liquids, such as paint, when they are left in the air, or others, such as heated milk, when they are left to cool（某些液体置于空气中或冷却后形成的）膜，薄层

[ C ] specialized internet & telecoms the pictures, designs, colours, etc. that appear on the screen of a mobile phone or other device and can be changed by the user皮肤（电脑程序的一部分，可随意改变以在屏幕上显示不同的图片、图案、颜色等）

to remove the skin of something剥掉…的皮，去掉…的皮