it's big and bule.rirds fly in it.what is it.的意思是什么

it's big and bule.rirds fly in it.what is it.的意思是什么
it's big and bule.rirds fly in it.what is it.的意思是什么

it's big and bule.rirds fly in it.what is it.的意思是什么
它又大又蓝,鸟儿们在里面飞翔,它是什么呢?
答案：天空（sky).