eohippus

n.<古生>始祖马

古代马科动物中的一种物种，现已灭绝。

名词

1. Eohippus, also known as the dawn horse, lived during the Eocene epoch.
红原马，又称拂晓马，生存在始新世时期。
2. Fossil evidence suggests that Eohippus was about the size of a small dog.
化石证据表明，红原马的体型大约与一只小狗相当。