Long ago, there were many kinds of dinosaurs. T. rex is the most famous. But experts say there are thousands we do not know about! They always look for new kinds.

很久以前，地球上有很多種恐龍。除了最有名的暴龍之外，還有上千種恐龍沒有被發現！因此，專家一直在找新種的恐龍。

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