《明史·志·卷六十八》
然而马终究不可少，于是恢复两年征收一匹马驹的制度，百姓更加困苦。
然马卒不可少，乃复两年一驹之制，民愈不堪。
However, horses were indispensable after all, so the system of collecting one horse colt every two years was restored, and the people suffered even more.