资料来源 : pyDict

地平面

资料来源 : WordNet®

ground level
     n 1: the height of the ground on which something stands; "the
          base of the tower was below grade" [syn: {grade}]
     2: the floor of a building that is at or nearest to the level
        of the ground around the building [syn: {ground floor}, {first
        floor}]