surface earthing

例句：

1. 1.The surface of the lake is covered in a thick layer of ice.
   湖的表面覆盖着厚厚的一层冰。
2. 2.The surface of the ocean is constantly changing due to wind and wave action.
   海洋的表面因风和波浪作用而不断变化。
3. 3.The surface of the earth is made up of different types of rocks.
   地球的表面由不同类型的岩石组成。