what am I?(猜一猜)用英语回答

You can't see me . 看不见，

And can't touch me . 摸不着．

I have no colour. 无颜色，

And no taste. 无味道．

I'm expensive. 很宝贵，

but everywhere. 处处有，

All life needs me. 生命离不开．

Cuess ,Whet am I? 猜猜我是谁？

air

空气