名词 ground rule:

1. (baseball) a special rule (as in baseball) dealing with situations that arise due to the nature of the playing grounds

groundwaven.地波groundn.地面；地方；根据；主题；立场；水平；背景v.使停飞；困在家中；放在地上；使 ... 搁浅；打基础动词grind的过去式和过去分词形式ground water- source heat pump地下水源热泵grounded base equivalent circuit基极接地等效电路ground-source heat pump system地源热泵系统groundwater flow numerical model地下水数值模型ground water enviroment question地下水环境问题Ground Foundation and Processing地基基础及处理ground-based radar observation地基雷达观测Ground System Coordinating Group地面系统协调组ground thread thread rolling die磨削加工螺纹滚压模ground-controlled interception地面控制截击

ground rules约定俗成的不成文法, 基本法则