A senior couple take a close look at the model of a new high-speed Fuxing train, China's next-generation bullet train, at the exhibition on September 29. Photo: Li Hao/GT

An elderly man takes photos in front of a model of Jiaolong, China's deep-sea manned submersible, on September 29. Photo: Li Hao/GT

People read copies of the letters of remorse of former high-ranking officials on September 29. Photo: Li Hao/GT

A woman takes a photo of a model of Xuelong, China’s icebreaker, on September 29. Photo: Li Hao/GT

On September 29, people crowded around an exhibition of the latest military equipment. Photo: Li Hao/GT