当异常半球中的神经元在成熟之前经历过多的细胞分裂时，就会发生这种罕见的疾病，即大脑一侧长得比另一侧大得多。

The rare disorder, in which one side of the brain grows substantially larger than the other, occurs when neurons in the abnormal hemisphere undergo too many cell divisions before they mature.

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疾病的早期诊断能够在严重的损伤发生之前给你机会采取行动。

Early diagnosis of diseases can give you a chance to take action before severe damage is done.

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比起在90岁之前的人，那些人都很少有慢性疾病。

There was no less chronic illness among survivors than among those who died before 90.

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