纪录片《长生不老》 19无法产生新的细胞

Bill's always believed there's a prime cause of ageing

比尔相信衰老是由某种主要原因导致的

and that if you look for it, you'll find it.

如果你试图寻找 也许会找到它

I knew since I was in high school that there's

从高中起我就知道

got to be some kind of clock that's ticking inside of us.

我们体内应该存在着像钟一样的东西

And it really frustrated¹ me that nobody knew what this clock was.

我十分沮丧 目前没有人知道这个钟是什么

But there had to be a clock and

不过这个钟一定是存在的

I just knew that some day we were going to find out what that was.

我确信某一天我们会发现它是什么

And he thinks he has.

他认为他已经找到了

Bill believes that the ticking clock is our telomeres.

比尔觉得 这个时钟是端粒

This theory says that every time our cells divide,

这个学说指出每次细胞分裂时

the tips of our chromosomes² - called telomeres - become shorter.

我们染色体的的尖端 叫做端粒 会变短

Eventually they become so short, they stop our cells dividing.

最终端粒变得太短 以至于细胞不能再分裂

We can't produce new cells and so we age.

我们无法再产生新的细胞 因此衰老

Telomere-shortening is an absolute problem that we have

端粒变短是个无法改变的问题

and every time our cells divide, our telomeres get short.

每次细胞分裂 我们的端粒变短

There's nothing we can do about it.

对此我们束手无策

No matter how well we eat,

不管我们吃得多健康

no matter how much we exercise,

运动多少时间

no matter how much we do everything our doctor tells us to do,

多么地遵医嘱

our telomeres still shorten.

我们的端粒依然会变短

1 frustrated   

adj.挫败的，失意的，泄气的v.使不成功( frustrate的过去式和过去分词 )；挫败；使受挫折；令人沮丧

参考例句：

• It's very easy to get frustrated in this job. 这个工作很容易令人懊恼。
• The bad weather frustrated all our hopes of going out. 恶劣的天气破坏了我们出行的愿望。 来自《简明英汉词典》

2 chromosomes   

n.染色体( chromosome的名词复数 )

参考例句：

• Chromosomes also determine the sex of animals. 染色体也决定动物的性别。 来自《简明英汉词典》
• Each of four chromosomes divide longitudinally. 四种染色体的每一种都沿着纵向分裂。 来自《现代汉英综合大词典》