English has a lot of Latin in it, plus if you are a cosmopolitan English speaker you probably get exposed to some French, Spanish (if only when you read the wrong side of a brochure at Home Depot and realize you understood it anyway), Latin, Italian, Portuguese, etc.

Interlingua doesn’t claim to serve any community outside European language users, but it does succeed at that, I think.

Overall interlingua is about as simple and regular as can be. A Chinese speaker might still be better off learning English but I can’t imagine they’d find interlingua any harder than any natural language.