鳥類普遍被認(rèn)為是從恐龍進化而來的。

　　Birds are widely believed to have evolved from dinosaurs.

　　恐龍熱興起于19世紀(jì)晚期。

　　The mania for dinosaurs began in the late 1800s.

　　有人提出哺乳動物是在6 500萬年前取代恐龍的。

　　It has been suggested that mammals took over from dinosaurs 65 million years ago.