麦肯齐患有线粒体疾病，这种疾病会让人丧失大量能量，并损伤心脏、肝脏、骨骼肌、呼吸系统和大脑等部位的细胞，从而使人衰弱。
McKenzie has mitochondrial disease, a debilitating condition that deprives the body of energy and damages cells in the heart, liver, skeletal muscles, respiratory systems and brain.
肌营养不良是30种遗传性疾病的一种，以骨骼肌进展性无力和变性为特点。
Muscular dystrophy is a group of more than 30 genetic diseases, characterized by progressive weakness and deterioration of skeletal muscles.
疾病和不习惯或过度运动可能会导致骨骼肌损伤。
Skeletal muscle damage can result from disease and unaccustomed or excessive exercise.
疾病和不习惯或过度运动可能会导致骨骼肌损伤。
Skeletal muscle damage can result from disease and unaccustomed or excessive exercise.
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