View of Zhalong National Nature Reserve in northeast ChinaChina's air passenger trips to reach 9 million during May Day holidayExplainer: Why are tourist trains gaining steam in China?View of Great Wall in BeijingTourists enjoy kiteboarding in HainanCentral Asian Leaders Attend Welcome CeremonyCentral Asian Leaders Attend Welcome CeremonyTourists enjoy kiteboarding in HainanXi Sends Congratulations to Micronesia's New PresidentMigrating grey cranes fly to national wetland park in SW China's Yunnan to overwinter