How can they fly up in the sky?的意思

How can they fly up in the sky?的意思 Birds fly in the sky的意思 The bird can fly in the sky. Which letter can fly in the sky?的回答是什么 Which letter can fly in the sky Can the parrot fly in sky ? __ birds can fly in the sky. I can fly 有一句是这样的 I can fly I am singing in the sky Fly in the blue sky什么意思 fly in the sky they fly in the sky 和they flying in the sky有什么不同 they fly in the sky 为什么不用they flying in the sky