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"异想天开"，汉语成语，比喻想象着荒唐离奇的事，或提出暂时难以实现的想法，可以翻译为“imagine something impossible”。还可以用英文俚语“ask for the moon”表示，意思是“to make requests or demands that are extraordinary or unreasonable”。
例句：
他要他爸爸给他买一艘游艇作为生日礼物，我想他真是异想天开了。
He asked his dad to buy him a yacht as a birthday present. I think he was asking for the moon.
别异想天开了，理智一点！
Don't ask for the moon. Be reasonable!
Editor：Jade
