of the first water
非常出色或优秀的；无与伦比的
书面·形容品质极佳或一流
英文释义
of the finest quality or highest degree; excellent or outstanding
例句
That diamond is of the first water, absolutely flawless.
典故来源
源自宝石鉴定，钻石按净度分级，“第一水”指最高品质，后泛指顶级。