It's highly unlikely that a human could live forever. Even though the average human life expectancy has increased dramatically since the beginning of the 20th century, it won't continue to double and triple until we're living for hundreds of years. Some scientists believe that there is a hard-coded maximum life expectancy for humans, and it's probably somewhere around 125 years old. One theory, known as the Hayflick Limit Theory, suggests that the cells in the human body may only divide and copy themselves a fixed number of times, and this limit puts arestriction on how long a person can survive. Once cells cease reproducing, organs and tissues become ineffective and shut down.
On the other hand, biological immortality is not necessarily impossible. One species of jellyfish, for example, known as the Turritopsis nutricula, seems to have the ability live forever by reversing its own aging process after sexual maturity. This type of discovery may provide comfort to futurists who hold out hope that human immortality is right around the corner. Scientists are hard at work developing pills and treatments that might add a few years to our life, but their search is hindered by how long human beings already live. It's difficult, after all, to construct a scientific experiment or clinicaltrial that may last for more than a hundred years.
小注1:表示人的寿命可以有三种说法,一种是life expectancy,一种是longevity,还有一种是life span。第一种最为通用,第二种偏学术,第三种显然最容易记忆容易书写,可根据情况选择。
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