清明节Pure Bright Festival; Tomb Sweeping Day; Qingming Festival
金无足赤,人无完人Gold can't be pure and man can't be perfect.
超纯水制造装置Ultra-pure Water Purifiers
国际理论和应用化学联合会International Union of Pure and Applied Chemistry，IUPAC
放射化学纯radiochemically pure
澈clear and pure
【化】 化学纯chemically pure
【化】 纯化学pure chemistry