thumb blue的用法和樣例：
例句
用作名詞 (n.)
- But what you don't know is that that sweater is not just blue, it's not turquoise, it's not lapis, it's actually cerulean.
但是你不知道這件毛衣不只是藍色的而已，它不是松石綠，不是靛藍，恰恰就是天藍色。 - Staining of ancient China is contained in natural plant pigments, such as the indigo blue dye.
我國古代染色是採用天然植物中所含的色素，如染青藍色的靛藍。
