以下为句子列表：
英文: Any random mutation in an intron that proved beneficial to the host organism would have been retained by natural selection.
中文: 插入子内任何偶然的突变，只要对宿主有利，就会在天择的筛选下保留。
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英文: Eventually another random mutation to a cancer gene knocks down another obstacle, initiating another burst of growth.
中文: 直到有另一个癌症基因产生随机突变，去除了另一个阻碍，而引发另一波的生长。
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