bron·to·sau·rus /ˌbrɑntəˈsɔrəs/
  雷龍
  Bron·to·sau·rus n.  Paleon. A genus of large sauropod American dinosaurs of the jurassic era, or an individual of that genus. A length of sixty feet is believed to have been attained by these reptiles.  The genus is also called Apatosaurus, and individuals of the genus are also called brontosaurs.
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  brontosaurus
       n : huge quadrupedal herbivorous dinosaur common in North
           America in the late Jurassic [syn: apatosaur, apatosaurus,
            brontosaur, thunder lizard, Apatosaurus excelsus]