鸟类普遍被认为是从恐龙进化而来的。
Birds are widely believed to have evolved from dinosaurs.
恐龙热兴起于19世纪晚期。
The mania for dinosaurs began in the late 1800s.
有人提出哺乳动物是在6 500万年前取代恐龙的。
It has been suggested that mammals took over from dinosaurs 65 million years ago.
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