purity

They worried about the purity of tap water.

他们担心自来水是否洁净。

In fact, New York’s municipal water for more than a century was called the champagne of tap water and until recently considered among the best in the world in terms of both taste and purity.

事实上，一个多世纪以来，纽约的市政用水一直被称为自来水中的香槟，直到最近，它才被认证为在味道和纯度方面都是世界上最好的水。

There are many different ways to measure agricultural performance besides food yield: energy use, environmental costs, water purity, carbon footprint and biodiversity.

除了粮食产量之外，还有许多不同的方法来衡量农业表现：能源使用、环境成本、水的纯度、碳足迹和生物多样性。

White has always been a symbol of purity in Western cultures.

在西方文化中，白色一向象征纯洁。

The soaring purity of her voice conjured up the frozen bleakness of the Far North.

她高亢、清亮的声音使人们想到了遥远的北方萧瑟的冰天雪地。