A hair normally grows from each follicle for about three years, is then shed, and a new hair grows.

一根头发通常从每个毛囊中生长约三年，然后脱落，然后一根新头又生长。

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When we are young, our hair is colouredby the pigments produced by cells in the hair follicle known as melanocytes.

年轻时，我们的头发的颜色是毛囊里的黑素细胞产生的色素造成的。

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Hair is dead, and once the main shaft of the hair follicle is extruded, expired biomass can't be tinted or bleached by psychological trauma or fear.

头发是死的，一旦其毛囊主轴受到挤压，其生物物质由于心理创伤或恐惧不能着色或漂白。

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Shiny, healthy hair starts with the vitality of cells in the hair follicle, where hair is manufactured, says Katz.

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Often the images show something else entirely, such as an infected hair follicle.

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Sometimes an epidermoid cyst has a central opening the remnant of a hair follicle from which the cyst originally formed that's plugged by a tiny blackhead.

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