Other agents can then produce transient changes which lead, with continued exposure, to cancer: this is known as tumour promotion.

还有一些物质能使细胞产生短暂性改变，若细胞持续暴露于这些物质当中，最终将导致癌症，这就是促肿瘤形成过程。

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Cellular senescence has been recently shown to have an important role in opposing tumour initiation and promotion.

细胞衰老已经在抑制肿瘤产生和扩展中显示出了重要的作用。

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