It says "dietary and lifestyle approaches to prevent cancer do not have to be extreme.
2
这就是因为当你研究生活方式对癌症风险的影响时，有很多复杂的因素需要考虑。
This is because there are so many complicating factors when you try to study the effects of lifestyle on cancer risk.
3
每天都有关于癌症与某种生活方式的最新的小报消息，有时候是浮夸，有时候是自相矛盾的。
EVERY day there are new stories in the tabloids about the latest link, sometimes tenuous, sometimes contradictory, between cancer and some aspect of lifestyle.
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