purity
n. 洁净，纯净；纯洁，清白 ；（声音、文章、音乐等的）清晰；纯度
n. （Purity）（肯）普丽蒂（人名）
例句
The water is regularly tested for purity.
水的纯度定期受到检测。
《牛津词典》
The purity of the water is tested regularly.
水的纯度定期检测。
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。
