surface blind plug

例句：

1. 1. The surface of the lakeis smooth and clear.
   湖的表面光滑透明。
2. 2.The surface of the ocean is vast andunforgiving.
   海洋的表面广阔而无情。
3. 3.The surface of the earth is covered inice and snow.
   地球的表面覆盖着冰和雪。