• So this week, we describe a natural way to dye wool.

    VOA: special.2010.08.02

  • It's usually colored because there's food dye in it, but it wouldn't be colored in its natural state.

    通常是五颜六色的,因为其中含食用色素,但在自然情况下,它是无色的

    耶鲁公开课 - 生物医学工程探索课程节选

  • It's usually colored because there's food dye in it, but it wouldn't be colored in its natural state.

    通常是五颜六色的,因为其中含食用色素,但在自然情况下,它是无色的

    耶鲁公开课 - 生物医学工程探索课程节选

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