异想天开的英语:indulge in the wildest fantasy; ask [cry] for the moon; ... be a fanciful illusion; be all wet; come out with most fantastic ideas; expect wonders; fanciful ideas; fantastic; freakish; get...
异想天开的法语:s'abandonner à son imagination extravagante;donner libre cours à sa fantaisie;des idées fantaisistes