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If a country can just print money, is global debt between countries real? 
This is a extremely complicated subject, but I assume you want a very simple answer (otherwise I'm not qualified to answer). The value of most currencies is closely tied to the economy of the county, so if China were to print a huge amount of yuan, then since the value of their economy has not really changed, the international currency markets would devalue the yuan to compensate. (This is rather like, if have shares in, say Apple, and they were to issue an extra billion shares, then the value of your shares would fall (by half), rather than for Apple to be suddenly be worth twice as much) Print too many notes and your currency basically becomes almost worthless, which is what happened to the Zimbabwean dollar. I like the idea of China skipping crate loads of actual yuan or dollars notes to America, but in practice, the borrowing is just a paper exercise, rather like an IOU. As to whether America owes Yuan or dollars, the answer is whatever has been agreed. Assuming the currencies are fairly stable, then since each country has more control over their own currency, it is natural for them to prefer their own currency. However, if America believes the value of the dollar will increase, they may prefer to pay back in Yuan (costing them less dollars), and if China believes the value of the dollar will decrease they may agree to that.