There is no cure for ALS, and the few available treatments have limited efficacy. About 90 percent of ALS cases are sporadic and of unknown, possibly environmental, origin.

肌萎缩侧索硬化不能治愈，几乎没有有效地治疗方法，大约90%的病例是散发的，未知的，可能与环境有关。

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There is no cure for ALS, and the few available treatments have limited efficacy. About 90 percent of ALS cases are sporadic and of unknown, possibly environmental, origin.

肌萎缩侧索硬化不能治愈，几乎没有有效地治疗方法，大约90%的病例是散发的，未知的，可能与环境有关。

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