pro.no.grade

adj.（形容詞）
Walking with the long axis of the body parallel to the ground. Used of quadrupeds.
（四足獸）俯行的：行走時(shí)身體的長(zhǎng)樞椎與地面平行的，用于四足獸

來(lái)源：
Latin prônus [leaning forward] * see prone
拉丁語(yǔ) prônus [向前屈身] *參見 prone
-gradus [walking] from grado [to move] * see retrograde
-gradus [行走] 源自 grado [行動(dòng)] *參見 retrograde