have your head in the clouds
沉迷于幻想或不切实际的想法，不注重眼前的现实
口语·批评走神或不切实际
英文释义
to be daydreaming or not paying attention; to be unrealistic or impractical
例句
Stop having your head in the clouds and finish your homework before dinner.
典故来源
源自古代观察天空的意象，指人像云一样飘忽不定，脱离现实，最早见于16世纪文学作品。