The word “international” gets thrown around as a marketing tool, a brittle term intended to connote sophistication that often rings hollow. But make no mistake: The Dubai World Cup Carnival, which starts again Thursday at Meydan Racecourse, is truly international. Even before horses ship for the Dubai World Cup card on March 28, stables from jurisdictions as far flung as Sweden, Korea, and Australia will set up shop for some rich winter racing in the desert.