在鸡身上观察到，一种叫滤过性病原体的病毒，很少能从它诱发的恶性肿瘤中恢复过来。
As observed with the chickens, the filterable agent, a virus, could seldom be recovered from the malignant tumor which it had induced.
他由此推测，病毒有可能诱发肿瘤，作为维持自己生存的安全天堂。
This led him to speculate that the virus may be creating the tumour as a safe haven to support its own existence.
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