1. 地面;地面水平;地面层：ground investigation 探土;土地勘测 | ground level 地面;地面水平;地面层 | ground level contour 地面水平等高线

2. 地平面：流出物地下處置 ground disposal of effluent | 地平面 ground level | 地面環路 ground loop

3. 基态能级：ground leakage current 漏地电流 | ground level 基态能级 | ground loop 接地回路

1. 地面（相对于高处或地下而言）
    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.

    e.g. The hotel is set on three floors. There's a bar and cafe at ground level...
           这家饭店有3层，在一楼有间咖啡吧。
    e.g. The remaining block of woodland is cut down to ground level.
           剩下的那片树林被砍得精光。

noun

1. the floor of a building that is at or nearest to the level of the ground around the building

    Synonym: ground floorfirst floor

2. the height of the ground on which something stands

    e.g. the base of the tower was below grade

    Synonym: grade