Certain genes can be switched off to prevent melanocytes from maturing.

某些基因可以被关闭以防止黑细胞成熟。

The melanocytes make the pigment, which is then packed into small packets of pigment called melanosomes.

黑细胞制造，然后将其装成称为黑体的小。

How long your melanocytes last—and therefore when you “go gray”—is mostly determined by your genetics.

你的黑细胞存活多久——因此你什么时候“变灰” ——遗传因决定。

Hair color comes from melanin, a pigment made by special cells called melanocytes.

发源自黑，这种名为黑细胞的特殊细胞生成。

Each hair gets its color from melanin, a pigment made by specialized cells called melanocytes in hair follicles.

每根头发的颜都来自黑， 这是一种毛囊中专门的细胞——黑细胞制造的。

And it doesn’t affect melanocytes, so for young people, the hair that falls out grows back its normal color.

而且它不会影响黑细胞， 因此对于年轻人来说， 掉下来的头发会长出原来的颜。

But as we age, there's declining levels of catalase, and this allows the build-up of hydrogen peroxide in the hair bulb, which damages and destroys the melanocytes, or the pigment producing cells, of our hair.

但随着年龄的增长，过氧化氢酶的水平会下降，这使得氢过氧化物在毛囊中积累，从而损害并破坏产生的黑细胞。