With immunosuppression, the dormant JC virus in these cells may be reactivated and start active replication, causing cell death and tissue destruction.

在免疫抑制时，这些细胞中的大部分病毒可能重新活化，开始活跃复制，导致细胞死亡和组织破坏。

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A stroke occurs when blood flow to the brain is decreased or interrupted, causing brain damage and brain cell death.

当人中风时，大脑中的血流量会骤然减少或中断，导致大脑损伤或脑细胞死亡。

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First, it increases the production of free radicals, highly reactive molecules that tear about sensitive cell components like DNA, causing premature cell death (apoptosis).

首先，造成自由基生成的增加，激活一些分子造成细胞中敏感物质如dna等的损伤，因而造成了细胞过早的凋亡。

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Noel Young, of Metal Bridge, near Carlisle, was serving a sentence for causing death by dangerous driving when he ran the drugs operation using three mobile phones from his cell.

BBC: Noel Young and Cumbria drugs gang jailed