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在我们生活的地球上,哪种脊椎动物最早的飞上天空?在恐龙统治地球的中生代,它们始终占据着天空,自由地翱翔于蓝天白云之间
Which of the earliest species of vertebrates flew into the sky on the planet we live in? The Mesozoic dominated the Earth by dinosaurs always occupy the sky and freely fly among blue sky and white clouds