The blue dye is obtained from the indigo plant.
蓝色染料是从靛蓝植物中提取的。
The blue vat dye obtained until about 1900 entirely from some species of the indigo plant.
直到大约1900年，蓝色还原染料都是从靛蓝植物中提取的。
The dye extracted from the indigo is bluer than the plant; so is the ice colder than the water.
青取之于蓝，而青于蓝；冰，水为之，而寒于冰。
应用推荐