The iguanodons and hadrosaurus evolved complex dentations for shearing and grinding plants.

禽龙和鸭嘴龙进化出复杂的齿状结构，用于剪切和研磨植物。

And the hadrosaurus also had a very broad beak.

鸭嘴龙的喙也很宽。

Ornithopods started off as bipeds, but the larger hadrosaurus probably walked on all four legs most of the time.

鸟脚类动物一开始是两足动物，但体型较大的鸭嘴龙可能大部分时间都是四足行走。