皮肤画纹现象

例句：

1. 1. The skin of the apple is very smooth.
   苹果的皮肤非常光滑。
2. 2. Skin cancer is a type of cancer that starts in the outer layer of the skin.
   皮肤癌是一种起源于皮肤外层的癌症。
3. 3. The skin on her face was pale and dry.
   她脸上皮肤苍白而干燥。