1. The disease causes the immune system to attack and demyelinate the nerves.

这种疾病会导致免疫系统攻击并脱髓鞘神经。

2. Multiple sclerosis is a condition where the body's immune system mistakenly demyelinates the nerves.

多发性硬化症是一种免疫系统错误地脱髓鞘神经的疾病。