Indigo : Blue vat dye, obtained until about 1900 entirely from some species of the indigo plant.
靛蓝蓝色还原染料, 约在1900年以前,一直是从木蓝植物获得.
The indigo plant or the blue dye obtained from it.
假蓝靛靛蓝植物或从这种植物中提取的蓝色染料.
Blue from indigo plant is deeper than its origin.
青出于蓝而胜于蓝.
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