How can sky lantern fly high up in the sky?

天灯为什么可以飞到天上去？

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They thought they would fly up to the sky, and have a joke there.

他们想飞上天空，在那里开个玩笑。

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The bird can fly in the sky because it has two wings.

鸟能在天空中飞翔是因为它有两个翅膀。

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The old system, he said, is outdated, doesn't use all of the sky and directs planes to fly farther and longer than they need to.

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