ground

土地, 战场, 场地, 地面, 范围

a position to be won or defended in battle (or as if in battle); a relatively homogeneous percept extending back of the figure on which attention is focused; a connection between an electrical device and a large conducting body, such as the earth (which is taken to be at zero voltage); (art) the surface (as a wall or canvas) prepared to take the paint for a painting

土地的, 地面上的

放在地上, 使搁浅, 打基础, 给...以训练

搁浅, 落地, 根据, 基于

磨过的

grind的过去式和过去分词