至第六代，细胞已失去增殖能力。
Up to the sixth passage, the cells lost their proliferation ability.
对各代肌腱细胞的活性与手术中进行比较。
Each generation of tendon cell activity compared with surgery.
就这样，病毒一代代地复制、繁殖，免疫细胞不断死亡。
In this way, the virus generation to generation copy, reproduction, the immune cells died.
就这样，病毒一代代地复制、繁殖，免疫细胞不断死亡。
In this way, the virus generation to generation copy, reproduction, the immune cells died.
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