earth tophr.
earthn.地球;泥土;世间
Earth temperature gradient地温梯度
earth continuity conductor接地导线
earth centered earth fixed地心地固坐标系
earth basic magnetic field地球基本磁场
earth faulty detect device接地监测装置
earth rocky mountain areas土石山区
earth ionosphere waveguide地球电离层波导
Earth observing technology对地观测技术
earth-tide gravity meter地球潮汐重力仪