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It keeps them high in the sky.

它使它們在天空中保持高高的。

It has no colour or shape.

它沒有顏色和形狀。

It has no smell or taste.

它沒有氣味和味道。

We cannot see it, but we can feel it.

我們不能看見它，但是我們可以感覺到它。

It is everywhere.

它到處都是。

It is important to all people.

它對所有人都很重要。

It is also important to animals and plants.

它對動物和植物也很重要。

We all need it to keep us alive.

我們都需要它使我們活著。

Look at the kite and the balloon.

看風箏和氣球。

Look at the plane and the bird.

看飛機和鳥。

They all need it too.

它們也都需要它。

It keeps them high in the sky.

它使它們在天空中保持高高的。

What is it?

它是什么？