How to explain in Chinese what the domestic and foreign markets（国外/国内市场） are in short and simple words (imagine explaining to a child)?

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国内市场：把货物卖给本国人；国外市场：把东西卖给外国人。I would explain such terms to my little niece like this😅 I hope this can be helpful to you.

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国内市场：俄罗斯人和俄罗斯人做生意
国外市场：俄罗斯人和老外做生意