吃透英语课本，提升在校竞争力
n. 纯净；纯洁；纯粹
It is also the colour of purity.
它也是纯洁的颜色。
the purity of tap water
自来水的纯净度
Her innocence and purity were evident.
她的纯真和纯洁显而易见。
optical purity
光学纯度
high purity
高纯度
n.[化学]纯度；纯洁；纯净；纯粹
fineness
immaculacy
已安全检测