A train runs in a mountainous area where flowers are in full bloom near Juyongguan Pass of the Great Wall in Beijing, capital of China, March 25, 2016.[Photo/Xinhua]

A train runs in a mountainous area where flowers are in full bloom near Juyongguan Pass of the Great Wall in Beijing, capital of China, March 25, 2016.[Photo/Xinhua]

A train runs in a mountainous area where flowers are in full bloom near Juyongguan Pass of the Great Wall in Beijing, capital of China, March 25, 2016.[Photo/Xinhua]