国家公园保护着数千英亩的原始林地。

The national park protects thousands of acres of ___virgin woodland.

环保团体正在开展运动，以拯救剩余的原始森林免遭砍伐。

Environmental groups are campaigning to save the remaining ___virgin forests from deforestation.

探险家记录了一个从未被人类绘制地图的原始山谷。

Explorers documented a ___virgin valley that had never been mapped by humans.