SYDNEY - Yin Qiang, a technology manager from Beijing, traveled from Australia's Gold Coast to Melbourne before climbing the Sydney Harbour Bridge with his wife. Next time, they might see a show at the city's iconic Opera House."This is a place I would go to again," said Yin, 42, who visited Australia on work trips several times before his holiday this month. "There's still a lot of things to explore."Chinese visitors are lifting an Australian tourism industry as a local currency that's gained 55 percent in the past four years against the U.S. dollar and 43 percent against the pound causes British and American arrivals to stagnate. The emergence of China's middle class is forcing tour operators to adapt to a clientele whose numbers are mushrooming five times faster than the overall growth in visitors.