translation.en: Cancer occurs when a single cell in your body acquires a set of random mutations in important genes that cause that cell to start to produce more and more and more copies of itself.
translation.zh: 一个肿瘤 当你体内的 一个细胞上的重要基因 发生一系列的偶发突变 这个细胞开始不断自我增殖 癌症就产生了