This is a picture of a neuron, this particular neuron has been filled with a fluorescent dye so that it's colored green.

这是一幅神经元的图片,这个特定的神经元,已经被荧光染料染成了绿色

耶鲁公开课 - 生物医学工程探索课程节选

just to cut hair, dye hair, curl hair, fun stuff.

剪头发，染头发，卷头发，有意思的事。

我的梦想是当发型师 - SpeakingMax英语口语达人

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