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.

但是你不知道这件毛衣不只是蓝色的而已，它不是松石绿，不是靛蓝，恰恰就是天蓝色。

youdao

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.

但你要知道那衣服不仅仅是蓝色。不是绿色，也不是青色，而是天蓝色。

youdao

She's a botanist, and she was wearing a feather in her hair, a cerulean blue feather, in honor of the occasion.

WSJ: Of Feathers, Showgirls and Biology

The sky beyond is washed with strokes of cobalt and cerulean blue, and a faint but perceptible smell of aniseed and wild garlic hangs in the air.

BBC: The three colours of Ibiza