first water

first-water的词性：
n.（名词）

1. The highest degree of quality or purity in diamonds or pearls.
第一流：钻石或珍珠在质量或纯度上的最高层次

2. The foremost rank or quality:
一流：排衔或质量上最高：

a pianist of the first water.
一位一流的钢琴演奏家

first-water的词源：

3. Probably translation of Arabic m3' [water, water luster]
可能为 阿拉伯语 m3'的翻译 [水，水珠光泽]