江苏省新技术新产品:脑筋急转弯 Why do birds fly south?

来源：百度文库 编辑：中科新闻网 时间：2024/05/10 03:26:48

it's impossible for them to walk to south.

Because it's too far to walk.
因为走着去太远了 呵呵

because they can;t walk south

yes
the upers you are right

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