pro.no.grade
adj.（形容词）Walking with the long axis of the body parallel to the ground. Used of quadrupeds.（四足兽）俯行的：行走时身体的长枢椎与地面平行的，用于四足兽
来源：Latin prônus [leaning forward] * see prone 拉丁语 prônus [向前屈身] *参见 prone-gradus [walking] from grado [to move] * see retrograde -gradus [行走] 源自 grado [行动] *参见 retrograde
