膀胱癌最主要的致癌因素是抽烟。
The most significant risk factor associated with Bladder cancer is smoking.
它具有高效、安全、有一定营养价值、无任何致癌因素等特点。
It has many advantages, such as high efficiency, safety, good nutritive value and non-carcinogen.
导致癌症死亡差异除了阿司匹林之外可能还有其它因素。
It's possible that factors other than aspirin accounted for the difference in cancer deaths.
现在，导致癌症的原因很复杂，基因突变只是其中的一个因素。
Now, the causes of cancer are complex. Genetic mutations are only one factor.
心理因素致癌的机制。
吸烟是导致癌症的主要因素。
吸烟是导致癌症的主要因素。
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