a very large dinosaur that ate plants and had four legs, a very long neck and tail, and a small head

All the dinosaurs we thought of as Brontosauruses were really Apatosauruses. 所有那些我们以为是雷龙的恐龙其实都是谬龙。

Apatosaurus, once known as Brontosaurus, was a huge plant-eating dinosaur about the size and weight of a large diesel locomotive. 谬龙曾被称为雷龙，是一种食草的巨型恐龙，其体积相当于一部大型柴油火车头。