ground tap for radiator

例句：

1. 1. The groundis covered in snow.
   地面覆盖着雪。
2. 2.The ground was hard and dry underfoot.
   脚下的土地坚硬而干燥。
3. 3. Thegroundwater is the sourceof life for many plants.
   地下水是许多植物生存的源泉。