山区空气的纯净度令人称奇。

The ___purity of the air in the mountains is remarkable.

他深深地为她性格的纯洁与纯朴所打动。

He was deeply moved by the ___purity and simplicity of her character.

科学家们正在检测水质，以确保其纯度符合严格标准。

Scientists are testing the water to ensure its ___purity meets strict standards.