【鞭长不及马腹】〖bin cháng bù jí m fù〗[be beyond one's grasp; beyond one's ability to; beyond the reach of one's power; cannot do it, much as one would like to]

鞭辟入里主义真，

长戟高门美资引。

不分主次全失业，

及第三元博硕遁。

马空冀北留移外，

腹背受敌富腐侵。

鞭子虽然很长，但是不应该打到马肚子。比喻力所不能及。Although whip long, can't beat reach horse's stomach. Metaphor power can not reach.同：鞭长莫及。反：绰绰有余。