And the compound that's left over from this process, an acid called isovaleric acid, starts to build up.

未分解的部分叫做异戊酸，开始积累下来。

But while isovaleric acid isn't exactly pleasant to smell outside your body, it can be downright damaging to the inside.

然而这种异戊酸让人很不愉快，它能够彻底的损害身体内部。

It's not exactly clear why, but a build-up of isovaleric acid tends to have the most dramatic effects on the central nervous system.

现在还不清楚原因，但异戊酸的积累往往会对中枢神经系统产生剧烈的影响。