其中的确切机制仍然是神秘的，但许多癌症是在基因水平开始的这种可能性表明，我们永远不可能预防所有癌症。

The exact mechanisms involved are still mysterious, but the likelihood that many cancers are initiated at the level of genes suggests that we will never prevent all cancers.

youdao

他补充说：“我认为，显然我们将评估所有这些措施，就像我们对待任何科学咨询意见一般，但现在我认为关闭学校是不可能的。”

He added: "I think we will obviously keep all of these things under review as we do with any scientific advice, but at the moment I think it is unlikely."

youdao

对所有的数应用“mod n”的目的是使攻击者不可能使用简单的技术（如过去我们使用的 对数）破解它。

Reducing everything "mod n" makes it impossible to use the easy techniques that we're used to such as normal logarithms.

youdao

But as theorists, we could be interested in the theoretical possibility that the right response is to not think about the facts of death at all.

但作为理论家，我们可能对“正确的回应是,根本不考虑所有关于死亡的事实”,在理论上的可能性感兴趣。

耶鲁公开课 - 死亡课程节选