Delayed notice, later today, three chapters will be added

Jian is a student. He pulled some subjects last semester and has been reviewing this week. Now I feel that the review is not complete. There will be an exam in the afternoon. In order to muddle through, the first chapter at 13: 00 will be postponed.

Today's Chapter 1: 6 p.m.;

Today's second chapter: 8 p.m.;