Wintering birds return to China's largest recovering freshwater lakeCentral Asian Leaders Attend Welcome CeremonyXi Calls for Enhancing AllChangbai Mountain launches serial summer eventsXi Sends Congratulatory Letter to Rehabilitation International Centennial CelebrationOver 100 blackInternational pump track park to open in China's ShenyangTourists view cherry blossoms at Yuyuantan Park in BeijingThailand welcomes 1st Chinese tour groups in 3 yearsSummer travel booms in country