Dragonflies and swallows and nighthawks seine the air where the minute winged creatures flit out their minute life spans.

蜻蜓、燕子和夜鹰在天空中像围网似地捕食，而极小的有翼动物在空中轻快地飞来飞去，顷刻间其想暂的生命便结束了。

Which of these insects has the shortest life span?

哪种昆虫寿命最短？

So genes matter less than what we thought before to life span.

所以基因对寿命的重要性比我们之前想象的少。

The brighter the star, the shorter its life span.

星星越亮，寿命越短。

It's because as our population grows and life spans increase, so do the cancer rates.

是因为随着人口增长和寿命延长，癌症发病率也在增加。

" Thankfully, the creatures we raise have a five-year life span, " Mr. Knapp said.

“庆幸的是，我们养的东西能活5年，”纳普说。

That is less than half of the life span that its employees can expect to enjoy.

几乎是它的员工工作寿命的一半。

Some economists argue that increased life spans are, in a very basic sense, good for the economy.

一学家认为，从非常基本的意义上说，延长寿命对有利。

And tires at the nose of the plane tend to have shorter life spans than the rest.

飞机机头的轮胎通常比其他轮胎的寿命更短。

Life spans seven orders of magnitude, from invisible bacteria to mites, ants, mice, dogs, humans, elephants and, blue whales.

生命的尺寸横跨七个等级， 从看不见的细菌到尘螨、蚂蚁、老鼠、狗、人类、大象、蓝鲸。

For example, we can ask to what extent genetic variations account for differences in life span between individuals.

比如，我们可以问遗传变异能在多大程度上影响个体的寿命差异。

Globally, the average life span is 71.4 years; for a few lucky people, it may exceed 100 years.

全世界人口的平均寿命是71.4岁，少部分幸运的人呢能够活到100多岁。

The same lower income man would live to 76, and the shortened life span has a big economic impact.

同样的低收入男性可以活到76岁，寿命缩短对的影响也很大。

The results add to a growing body of evidence that certain psychological factors may predict a longer life span.

有越来越多的证据表明某心理因素或许能预示更长的寿命，该研究的结果进一步证实了一点。

Perhaps most interesting is that birds perform these distraction displays differently at different periods in their offsprings' life span.

也许最有趣的是，鸟类会在它们后代生命的不同时期的采用不同的迷惑表演手段。

However, the life span of the new fence can reach 30 years, which can save resources and is economical.

而新围栏的寿命可达 30 年，既能节约资源，又实惠。

They estimated that the genetic variations account for about a quarter of the differences in life span between individuals.

他们估计出遗传变异对个体寿命差异的影响大约占 1/4。

This was largely based on insurance industry estimates that his life span was estimated to be a further 13 years.

主要是基于保险业的估计，即他的寿命估计还有 13 年。

Now he saw that his life span had always been determined by how long it took to eliminate all the Horcruxes.

现在他终于知道了，他生命的长短始终是由消灭所有魂器需要多少时间而决定的。

That means, of course, that some parts of the world see much shorter life spans, while others enjoy far greater longevity.

显然，意味着世界上某地方的人的寿命要短得多，而其他地方的人的寿命则长得多。