人為什么活得比狗長壽你造嗎英語美文

　　Dogs are mammals like humans, and they have a heart, lungs and all the things you need to survive. Our pet dogs give us so much happiness, but then so much sadness when they die. So why don’t they survive as long as us?

　　狗是像人類一樣的哺乳動物，它們擁有心臟，肺和所有生存所需的東西，我們的寵物狗給了我們?nèi)绱硕嗟目鞓�，但是當他們死去時，我們是那么的悲傷。那么為什么他們不能活得像我們一樣久呢?

　　Scientists worked out a long time ago that the lifespan of animals is mostly related to their size. Bigger animals usually live longer than smaller animals.

　　很久以前科學家就研究出動物的壽命與它們的體型大小有關。較大的動物通常比較小的動物壽命更長。

　　The main reason people used to think big animals live longer is because of something called metabolic rates. A metabolic rate is like how much petrol a car uses - cars that use up their petrol more slowly can drive for longer, a bit like animals with lower metabolic rates. Smaller animals usually have higher metabolic rates, which lead to shorter lifespans, like a car that uses up its petrol very quickly.

　　人們過去認為大動物活得更長的主要原因是因為代謝率。代謝率就像一輛汽車使用多少汽油，更慢地使用汽油的汽車可以開得更久，有點像代謝率較低的動物。 較小的動物通常具有較高的新陳代謝率，這導致壽命縮短，就像汽車很快耗盡汽油一樣。

　　The problem is that this doesn’t work for all animals. Some parrots have high metabolic rates but can live for more than 80 years! A metabolic rate is related to heart rate, and some parrots have a heart rate of 600 beats per minute. (Your heart beats around 70 to 100 times per minute.)

　　問題是這并不是對所有的動物都起作用。一些鸚鵡的代謝率很高，但可以活80年以上!代謝率與心率有關，一些鸚鵡的心率為每分鐘600次。(你的心臟每分鐘跳動70到100次左右。)

　　And dogs are one of the animals that do not follow this rule.

　　而狗是不遵循這個規(guī)則的動物之一。

　　Dogs don’t follow the rules on larger animals living longer. A 70kg Great Dane is lucky to reach seven years, but a 4kg Chihuahua can live for 10 years or more. We still don’t really know why this happens. But if you want a dog that lives longer, you should choose a small breed.

　　狗不遵守大型動物壽命較長的規(guī)則。70公斤的大丹犬如果幸運則壽命能達到7年，但是4公斤的奇瓦瓦狗可以活10年或更長時間。我們?nèi)匀徊恢�道為什么會發(fā)生這種情況。但是如果你想要一只活得更長的狗，你應該選擇一個小品種。

　　People now think it might depend on the “evolutionary pressures” that each animal faces. An evolutionary pressure includes things like other animals that want to kill you for food. Because they are so big, large animals like elephants and whales are less likely to be attacked in the wild than small animals like guppies or mice.

　　人們現(xiàn)在認為這可能取決于每只動物所面臨的“進化壓力”。進化壓力包括其他想要殺死你的動物。因為它們非常大，像大象和鯨魚這樣的大型動物不像野生動物或老鼠這樣的小動物在野外易受到攻擊。

　　We want to know how to help dogs live longer. There is a lot of scientific research on why dogs age and how to help them live longer. This is partly because we love dogs, and partly because learning about them can help us figure out how humans can live longer too. Dogs suffer from the same kinds of problems that people do as they get older, including getting fat and having painful joints.

　　我們想知道如何幫助狗活得更久。有很多科學研究：為什么狗的年齡短以及如何幫助他們長壽。這些研究的目的一是因為我們喜歡狗，二是因為了解它們可以幫助我們弄清楚人類如何長壽。狗常患有與人類年齡相同的問題，包括發(fā)胖和關節(jié)疼痛。

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