Humans have a wide variety of accents.
人类有各种各样的口音。
Birdsong is one of the most instantly recognisable sounds in nature.
鸟鸣是自然界中最容易辨认的声音之一。
The cacophony of sound that we hear at dawn tells us that the birds are awake and ready for the day.
黎明时，高亢的鸟鸣声告诉我们，鸟儿已经醒来，即将开始新的一天。
To the untrained ear it can actually just sound like a whole bunch of high-pitched sounds,
对于未经训练的人来说，那就是一长串高音调的声音。
but each species has its own unique call,
但其实每种鸟类的声音都是独特的。
and if you listen really carefully, within those species you'll start to notice subtle differences.
如果你非常认真地听，就会注意到不同种类鸟鸣之间的细微差别。
Evidence actually suggests that birds have regional dialects.
有证据表明鸟类间也存在地域性方言。
For example, town birds will have a slightly higher pitch than birds from the countryside.
例如，生活在城镇中的鸟类的叫声要比生活在乡下的鸟类的叫声音高更高。
And in the case of the yellowhammer, they actually have a completely different song in New Zealand,
以金翼啄木鸟为例，新泽西地区的鸟鸣声就与英国地区的完全不同，
even though genetically they're the same bird as that in the UK.
即使从遗传学层面上来讲，它们是完全相同的种类。
【老师英文】为什么成年人想改变自己，都会去学英语？
两个字来回答：机会
一个获得更多人生选择的机会，譬如新的工作环境，选择更好的交际圈子，选择更广阔的视野……
生活就是一环扣一环，被高考这道坎拦下的人，失去的高度并不只是两所大学之间的差距，还有未来无限选择的可能。而职场则是你
人生的第二次选择，你将如何把握住这个机会？
给你的人生多一个选择?：http://m.spiiker.com/event/everyday/
