| 单词 | what planet is someone on? | 
| 释义 | what planet is someone on?  or what planet does someone come from?  said to mean that you think someone has crazy ideas, or behaves in a very strange way, or does not understand something at all   How on earth do they expect me to fund a nanny? What planet are they on?' Easy Learning Idioms Dictionary. Copyright © HarperCollins Publishers  | 
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