Journey of the Broken Sword

I started writing a Gu Longfeng book and also taught mathematics. Chalk ash falls on the manuscript paper, like snow. The class lasts forty-five minutes, and there is no clock in the world. When the bell rang, the swordsman had just unsheathed his sword and the light of his sword stopped in mid-air. But I'm not in a hurry. Because tomorrow we will talk about probability. And in the world of rivers and lakes, you will eventually meet what you should meet, and what you can't finish writing will eventually be finished.