Onboard The Royal Caribbean Ovation of the Seas Cruise Ship [Getty Images]

The Ovation of the Seas Quantum-class cruise ship, operated by Royal Caribbean Cruises Ltd., sits berthed at the Kai Tak Cruise Terminal in Hong Kong, China, on Friday, April 21, 2017. Lines including Royal Caribbean and Carnival Corp. have sent an armada of luxury vessels to China to tap the world's fastest-growing market, but they face turbulent waters. Photographer: Justin Chin/Bloomberg via Getty Images

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