我们能源系统的主要组成部分，如燃料生产、提炼、发电和分配，用的是昂贵的、使用寿命较长的装置。

The major components of our energy systems, such as fuel production, refining, electrical generation and distribution, are costly installation that have lengthy life span.

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但在剩下的时间里，尽管癌症的风险在临终时增加，它必须与其他因素，如剩余寿命平衡。

But for the remainder, the risk of cancer, while increased at the end of life, must be balanced with other factors like remaining life expectancy.

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各种干预措施，如抗感染药物，可以增加人口的平均存活时间，但只有那些减缓人体衰老速度的方法才能延长最长寿命。

Various interventions, such as infection-fighting drugs, can increase a population's average survival time, but only approaches that slow the body's rate of aging will increase the maximum lifespan.

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