first-water的用法和樣例：
例句
用作名詞 (n.)
- She annexed the first prize in the speech contest.
她在演講比賽中獲得頭等獎。 - I'd like a first class express ticket to Shanghai.
我要買一張去上海的頭等快車票。
用作名詞 (n.)
- She is a scientist of the first water.
她是第一流的科學家。 - The pianist was quite good, but he was not in the first class.
這位鋼琴家彈得很好，但他不是第一流的。 - The first prize was awarded to the best competitor of the annual sports meeting.
頭獎頒給了這一年一度的運動會上最優秀的運動員。 - The Scoutmaster wanted the best boys to put up the tents and let the awkward squad go off and fetch water.
童子軍領隊要最優秀的男孩子來搭帳篷，而讓那些毛毛腳的生手去打水。
