ALS，即肌萎缩侧索硬化症，是一种影响运动神经元的神经系统疾病。运动神经元负责把大脑发出的指令传递给肌肉，当这些神经元逐渐受损，肌肉便会失去力量，动作也会变得越来越困难。疾病可能影响手臂、腿部、说话、吞咽或呼吸，但每个人的起始症状和发展速度

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