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In terms of evolution, there has to be a reason for barking, or it probably wouldn't be there.
從進化的角度而言，狗汪汪叫肯定是有理由的，要不這叫聲肯定在漫長的進化過程中給淘汰掉了。
Is it to warn of predators?
那么這叫聲是為了警告捕食者么？
But dogs bark when there are no predators around.
但是周圍沒有捕食者的時候狗也會汪汪叫。
Is it play?
那么它只是在玩耍嗎？
Some dogs play without barking.
有些狗玩的時候也沒有發出叫聲。
In fact, people who study canine behavior find there isn't much of a pattern to barking-it seems to be an all-purpose noise.
事實上，研究狗類行為的專家告訴我們，狗的叫聲并沒有固定的形式。它只是是一種多用途的響聲。
Now here's another fascinating thing: adult wolves don't bark.
另一件讓人著迷的事情是：成年的狼并不會吠叫。
They growl, and they whine, but no barking.
它們只是嚎叫、哀鳴，但并不吠叫。
And dogs evolved from wolves.
但是狗是從狼進化而來的。
So where did the bark come in?
那么，狗的這種吠叫聲是從何而來的呢？
Mark Feinstein and Ray Coppinger of Hampshire College in Massachusetts have a theory.
對此，來自馬薩諸塞州罕布什爾學院的馬克?范斯坦和雷?科平杰提出了一種理論。
These biologists have noted that while adult wolves don't bark, adolescents do.
這兩位生物學家注意到，雖然成年的狼不會吠叫，但是狼崽會。
Wolf pup barking seems to be an intermediate noise you grow out of.
狼崽的吠聲就好比是在它成長發聲過程中的一個中間產物。
