A man sits in front of a memorial wall to remember his wife and two sons who died in the fatal earthquake that flattened the city of Tangshan, in North China's Hebei province, 35 years ago, July 26, 2011. [Photo/Xinhua]

A woman holds flowers in front of a memorial wall to pay her respects to her three children who died in the fatal earthquake 35 years ago that flattened the city of Tangshan, in North China's Hebei province, July 22, 2011. [Photo/Xinhua]