geographic observation unit geographical observers
Related Translations:
地域: 1.(相当大的一块地方) region; district 短语和例子中国地域辽阔, 人口众多 china has a vast territory and a large population.2.(地方) local; 地域观念 regionalism; 地域分工学说 “theory of territorial division of labour” (亚当斯密提出)