classes:  lecturer. lectures are not vivid, often boring for students, students do not absorb much of the knowledge he said.  curriculum. lectures are not vivid, often boring for students, students do not absorb much of the knowledge he said.  facility. lectures are not vivid, often boring for students, students do not absorb much of the knowledge he said.  general. lectures are not vivid, often boring for students, students do not absorb much of the knowledge he said.