环保专家利用地理信息系统分析森林覆盖变化。

Environmental experts use ___GIS to analyze changes in forest cover.

辛辣食物经常让我的肠胃不舒服。

Spicy food often upsets my ___GI system.

许多二战时期的G.I.们回国后成为了国家的建设者。

Many ___G.I.s returned home after World War II and became builders of the nation.