pristine

这片海滩保持着原始状态，没有被游客破坏。

The beach remains ___pristine untouched by tourists.

雪后的早晨，整个公园看起来一尘不染。

After the snowfall, the park looked ___pristine in the morning light.

这片森林保持着原始状态，几乎没有人类活动的痕迹。

The forest remains in a ___pristine condition, with almost no signs of human activity.