Wherever you have hair, the hair is susceptible to oxidative damage and eventually going gray.

无论头发长在何处，头发都容易受到氧化损伤并最终变白。

We know that stress creates oxidative damage in the body, and it's been linked to a lot of premature-aging syndromes.

我们知道压力会对身体造成氧化损伤，并且与许多过早衰老综合症有关。

Ammonia appears to mainly target astrocytes, a type of glial cell in the brain, and although the mechanisms aren't fully understood, ammonia seems to cause astrocyte swelling and oxidative damage.

氨主要出现在星形胶质细胞中，它是脑内的一种神经胶质细胞，虽然具体的机制我们仍然不清楚，不过氨似乎能导致星形胶质细胞肿大和氧化损伤。

So it's thought that the stress, that stress causes oxidative damage, which may cause damage to the melanocytes and may cause us to grow gray earlier.

因此人们认为压力会导致氧化损伤，这可能会损害黑色素细胞， 并可能导致我们更早变白。

We know that smokers tend to go gray moreso than the general population, and again it's felt that it's probably due to the oxidative damage that smoke causes and how it affects the pigment-producing cells in the hair.

我们知道, 吸烟者比一般人群更容易变白, 而且人们认为这可能是由于吸烟引起的氧化损伤以及它如何影响头发中产生色素的细胞。