在月亮上怎么说英语

To say "How do you say X in English on the moon?" in English, you can say "How do you say X in English on the moon?"

To say something in English on the moon, you would simply use the English language as you normally would. The moon does not have its own language, and the language used by people on the moon would depend on the language spoken by the individuals involved. If you are communicating with someone on the moon and want to use English, you can simply use English as you normally would.