DK dinosaur atlas 恐龙英文版

THE BICGEST FLYINC ANIMALS that have ever existed patrolled the skies during the age of the dinosaurs. They were the pterosaurs- lightweight flying reptiles that were related to the dinosaurs. The smallest were the size of sparrows, but the largest were the size of light planes. They had hollow bones like birds, and long. typically toothed beaks. Their wings were membranes of elastic skin, rather like those of a bat, but unlike a bat's wings each was supported by a single, elongated fourth finger bone.
在恐龙时代，曾经存在的最大的苍蝇类动物在天空中巡逻。它们是翼龙——与恐龙有亲缘关系的轻量级飞行爬行动物。最小的是麻雀的大小，最大的是轻型飞机的大小。他们的骨头中空得像鸟，而且很长。典型的有齿喙。它们的翅膀是有弹性的皮肤膜，很像蝙蝠的翅膀，但不同于蝙蝠的翅膀，每个翅膀都由一根细长的第四指骨支撑。