virgin ·adjective
Definition: Virgin land, forest, etc. has not been used or damaged by people. Level: C2
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.