pure的名字是purity。
purity n. the quality or state of being pure纯，纯洁，洁净，纯正，纯粹
例如：the purity of tap water
自来水的纯净度
spiritual purity
心灵的纯洁
The water is regularly tested for purity.
水的纯度定期受到检测。
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。
