蜂鸟发现花蜜和花粉是很有营养的.Hummingbirds have discovered that nectar and pollen are very nutritious.为什么蜂鸟和大猩猩都有脊骨?Why do hummingbirds and gorillas both have backbones?小蜂鸟栖在山楂树枝上.The hummingbird perches on a twig of the hawthorn....
The brontosaurus was one of the largest of all dinosaurs.雷龙是所有恐龙中最大的一种.A two foot - long drill bit tipped the end of a brontosaurus - like creature's long neck.一枚两英尺长的钻头在一头 状 似雷龙的大家伙的长颈一端咬了一口....