What if the asteroid that forever changed life on Earth missed the planet completely and giant dinosaurs never became extinct? In this epic journey into the world of dinosaurs, an Apatosaurus named Arlo makes an unlikely human friend. While traveling through a harsh and mysterious landscape, Arlo learns the power of confronting his fears and discovers what he is truly capable of.如果百万年前那颗彻底改变地球命运的小行星偏离了轨道，没有撞击地球，恐龙也没有灭绝，那又会是怎样的一番天地？在这段意义非凡的恐龙世界之旅中，你会看到一只叫阿乐的雷龙和一个看上去不太可能成为朋友的穴居人类小男孩结成了伙伴。他俩结伴同行，经历了艰险又神秘的大自然的考验，而阿乐不仅从中学到了如何面对自己的恐惧，而且还发现了自己真正的能力所在
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