what am (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 猜猜我是谁?