狗是脊椎动物。
To turn or rotate(a limb) so that the inner surface faces down or back. Used of a vertebrate animal.使(手,前肢等)掌面向下转或 旋(四肢) 使 其内侧表面朝下或朝后。
This is the first time in a vertebrate animal that you can show such a clear connection between an animal's behavior and the changes at the molecular level.这是脊椎动物首次清楚地显示出动物行为和分子层级变化之间的关系。