ground level

1. N-UNCOUNT If something is at ground level, it is at the same level as the ground, as opposed to being higher up or below the surface. 底层[oft prep N]

The hotel is set on three floors. There's a bar and cafe at ground level. 旅馆有三层楼。底层有个酒吧和咖啡厅。

The remaining section of woodland is cut down to ground level. 林地的剩余部分被砍光了。