Definition
To be out of touch with reality and immersed in daydreams or fantasies.
脫離現實
She's always distracted, it's like she has her head in the clouds.
她總是心不在焉，好像她的腦袋在雲端裡。
He's always daydreaming; his head must be in the clouds.
他總是做白日夢；他的腦袋一定在雲端裡。
You can't always have your head in the clouds; you need to face reality.
你不能總是腦袋在雲端裡；你需要面對現實。