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1、How many times must a man look up, Before he can see the sky.

一个人到底要抬几次头，才能看到蓝天？

2、It's very important to keep in mind that earth is our only home,

记住地球是我们唯一的家园是非常重要的，

and it's a good planet.

并且她是一个好的星球。

And you know the saying:good planets are hard to find.

你知道那句话：“好星球难求”。