Foreword introduction: The spacious and bright middle hall is the prologue hall of the exhibition hall. The foreword desk made of black granite is placed in the center, which looks particularly solemn. On the walls on both sides are two bronze reliefs of 3 meters high and 6 meters wide each. "Catching a Young Man" and "Reunion", they use different eras and different artistic styles of characters to form a strong contrast; they span a long time and space, and systematically show the beginning and end of events from catching a young man to reunion.