化学物质对DNA的伤害、紫外线照射、电离辐射和病毒感染都是致癌诱因，而且，只要小心谨慎行事这些因素都能避免。
Chemicals that damage DNA, ultraviolet light, ionising radiation and viral infections are all culprits too—and culprits that can often be avoided by thoughtful behaviour.
化学物质对DNA的伤害、紫外线照射、电离辐射和病毒感染都是致癌诱因，而且，只要小心谨慎行事这些因素都能避免。
Chemicals that damage DNA, ultraviolet light, ionising radiation and viral infections are all culprits too—and culprits that can often be avoided by thoughtful behaviour.
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