请问这个歌曲的歌词含义

Somewhere over the rainbow way up high
There's a land that I heard of once in a lullaby
Somewhere over the rainbow skies are blue
And the dreams that you dare to dream really do come true

Someday I wish upon a star
And wake up where the clouds are far behind me
Where troubles smelled like lemon drops
Way above the chimney tops
That's where you'll find me

Somewhere over the rainbow blue birds fly
Birds fly over the rainbow
Why then, oh why can't I?

Somewhere over the rainbow blue birds fly
Birds fly over the rainbow
Why then, oh why can't I?

If happy little blue birds fly beyong the rainbow
Why, oh why can't I ?

彩虹深处 高高在上
有一片土地
曾在我的梦中出现

彩虹深处 天空湛蓝
有一些梦想
你敢憧憬就会实现

但愿有一天 我能去到星星
醒来发觉云儿被远远抛在身后
烦恼消散 如同化为蜜汁
高耸的烟囱顶上
在那儿 你能找到我

彩虹深处 蓝色的知更鸟在飞
鸟儿飞越彩虹