观测: observe; observation; viewing 短语和例子观测气象 make weather observations; 对 ... 作仔细的观测 make a careful observation of ...; 观测天体 take an observation; 观测报告 observation report; 观测点 observation point;
地球: the earth; the globe◇地球扁率 compression [flattening] of the earth; 地球扁球体 earth spheroid; 地球变化磁场 variable magnetic field of the earth; 地球表面 earth surface; 地球波导 terrestrial waveguide; 地球测绘电子学