1·Over the course of 80 million years, they evolved into tractor-trailer sized, long-necked plant-eaters, like Apatosaurus, formerly known as Brontosaurus.
经过八千万年的演化，他们变成了长脖子的草食性恐龙，并且长得像拖拉机那么大了，就如迷惑龙，以前称雷龙，那么大。
3·The most famous is Brontosaurus, the genus name of the sauropod dinosaur.
最有名的是蜥脚属恐龙——雷龙（Brontosaurus）的那次。