保护我们空气和水的纯净很重要。

It is important to preserve the ___purity of our air and water.

中国诗歌的美、纯净和力量难以抗拒。

The beauty, ___purity and power of Chinese poems is hard to resist.

实验室测试确认了该化合物的高纯度。

The laboratory tests confirmed the high ___purity of the chemical compound.