Glands underneath our skin manufacture sebum, an oily substance that coats hair follicles.

我们的皮肤下的腺体会产生皮脂，这是一种覆盖毛囊的油性物质。

Androgen hormones are linked to sebum production.

雄性激素会影响皮脂的分泌。

This is because sebum is composed of both saturated and unsaturated fatty acids.

因为皮脂是由饱和脂肪酸和非饱和脂肪酸共同组成的。

In the process, sebum makes hair clump together and appear greasy.

在这个过程中，皮脂使头发聚集在一起，看起来油腻。

Malassezia eat sebum by secreting an enzyme that releases all of the oil's fatty acids.

马拉色菌分泌一种酶，分解皮脂中的所有脂肪酸。

Testosterone sends the production of sebum into overdrive, increasing the incidents of blockages.

睪酮会让皮脂的分泌失控，提高阻塞发生的机率。

When the white blood cells die, they, combined with the dead skin and sebum, create the pus-filled pimple.

当白血球细胞死去时，它们再加上死皮和皮脂，就会造成化脓的痘痘。

So during puberty, when the hormones are highly active, there's an increase in sebum production.

所以在激素高度活跃的青春期，皮脂分泌也会增加。

When you're stressed, you produce more hormones, which then increases your sebum production.

当压力增大，激素水平会上升，从而导致皮脂分泌增加。

Babies' glands create sebum at a much slower pace than adults', so their hair is usually less oily and greasy.

因为和成人相比，婴儿的腺体产生皮脂的速度要慢得多，所以通常他们的头发不会那么油腻。