Definition: the outer layer of a fruit or vegetable Level: B2
他剥了香蕉，扔掉了皮。
He peeled the banana and threw away the ___skin.
我不小心踩到香蕉皮摔倒了。
I accidentally stepped on a banana ___skin and fell.
苹果皮富含纤维。
The ___skin of an apple is rich in fiber.
