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The story follows a young girl named JoJo whose life is turned upside down when her beloved dance coach decides to retire and is replaced by a sparkle-hating instructor named Poppy. Wanting to stay in the running for an upcoming dance competition, JoJo and her best friends, The Rubies, must try their hardest to abide by Poppy’s new, harsh rules. Realizing she cannot hide her sp...。核试验科教记录片。是自人类发明原子弹、氢弹以来的各种核爆炸记录，采访了许多美国参与核试验的专家，非常珍贵的第一手资料。著名的“小男孩”（广岛）和“胖男人”（长崎）就在这里，不可不看！ On July 16, 1945, at a site called Trinity, a plutonium bomb was assembled and brought to the top of a tower. The bomb was detonated, producing an intense flash and a fireball that expanded to 600 meters in two seconds. The explosive power was equivalent to 18.6 kilotons of TNT. It grew ...。