What kind of horse does Ma Xu refer to?

Xu refers to a tired, inferior or useless horse. Zhou Li Xiaguan Ma Zhi: "A horse measures three things, one is a military horse, the other is a war horse, and the third is a horse.

(1) [Bad horse]: A horse that can't run fast.

(2)[ Jade]: A tired, inferior or useless horse.

This is a great contribution to the success of Ma Xu. -"Xunzi, Encourage Learning"

(3)[ Screw]: A horse that is exhausted, too weak to move or otherwise unhealthy.

Metaphor is a slow person.