英语翻译Some scientists believe that birds do sing some of time

英语翻译
Some scientists believe that birds do sing some of time just because they are happy.However,they sing most of the time for a very different reason.Their singing is actually a warning to other birds to stay out of their territory.
Do you know what a “territory” is?A territory is an area that an animal,usually the male,claims as its own.Only he and his family are welcome there.No other families of the same species(物种) are welcome.Your yard and house are your territory where only your family and friends are welcome.If a stranger should enter your territory and threaten you,you might shout.Probably this would be enough to frighten him away.
If so,you have actually scared the stranger away without having to fight him.A bird does the same thing.But he expects an outsider almost any time,especially at nesting(筑巢) season.So he is screaming all the time,whether he can see an outsider or not.This screaming is what we call a bird’s song,and it is usually enough to keep an outsider away.
Birds sing loudest in the spring when they are trying to attract a mate and warn others not to enter the territory of theirs.
You can see that birds have a language all their own.Most of it has to do with attracting mates and setting up territories.
高手帮翻译下,翻译器翻译的免了,
这两篇都是翻译器翻译的，

一些科学家认为鸟类是这样唱的时间有些仅仅是因为他们感到高兴.然而,他们唱的是为一个截然不同的原因大部分时间.他们唱歌,实际上也是对其他鸟类警告远离其领土内.
你知道什么是“领土”?阿境内的一个领域是动物,通常是男性,作为自己的索赔.只有他和他的家人都不受欢迎.的（物种）同一品种没有其他家庭欢迎.您的院子,房子是你的领土,是只有你的家人和朋友的欢迎.如果一个陌生人进入你的领土,并威胁你,你可能会留言.也许这将足以吓唬他带走.
如果是这样,其实你害怕陌生人的距离,而不必打他.鸟做同样的事情.但他预期,几乎任何一个局外人,尤其是在嵌套（筑巢）旺季.因此,他是尖叫所有的时间.这尖叫就是我们所说的鸟的歌,而且通常足以让外人了.
鸟唱最响的春天,它们正在试图吸引配偶和警告别人不要进入他们的领土.
你可以看到鸟类的语言都属于自己.其中大多数是关乎吸引配偶和建立地区