在我们脚下的泥土里,深埋着许多的秘密。即使一片石头、一堆泥沙,也都曾有过一段不为人知的经历。谁能让石头和泥土说话?那只有地质古生物学家了。我知道一位杰出的科学家——舒德干,是他从一块块小小的化石片上,层层解开了 150年前达尔文关于生物演化的未解之谜,发现了人类进化最早的足迹。 There are so many secrets in the mud under our feet. Even a stone, a pile of sediment, but also have had an unknown history. Who can make the stone and soil speak? That is only a paleontologist. I know an outstanding scientist, Shudan, who solved the unsolved mystery about the evolution of biology 150 years ago from layers of small fossils and discovered the earliest human evolution footprint.