The cells in our hair bulb produce a little bit of hydrogen peroxide, which is a metabolic byproduct, and typically there's an enzyme called catalase that breaks this down to water and oxygen.

我们毛球中的细胞会产生一点过氧化氢, 这是一种代谢副产物, 通常有一种叫做过氧化氢酶的酶将其分解为水和氧气。

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，这会导致毛球中过氧化氢的积聚，从而损害和破坏头发的黑色素细胞或产生色素的细胞。