skin pass mill

例句：

1. 1.The skin is the outer layer of the body that protects us from the outside world.
   皮肤是身体的外层，保护我们免受外界伤害。
2. 2. The skin passes over the surface of the earth.
   皮肤覆盖着地球的表面。
3. 3. The skin passes over the surface of the earth and absorbs heat.
   皮肤覆盖着地球的表面，吸收热量。