Key for reference:

The strong and the weak points of online education and conventional education

A: Online education has developed greatly. Many colleges are offering online courses. I think the advantages of online education are many. The first advantage is that we can find a large amount of teaching materials.
B: Yes, there's really an ocean of information.
A: The second is that there are many choices of courses, and there is no limit to the number of students in the same course.
B: Yeah, really. Most of us freshmen are learning a course of computer skills online. It saves a lot of money for our university.
A: Yes, that's a good point. And online education can save people time. You don't need to go to a classroom to have the class.
B: That's another advantage. But online education still has its disadvantages. You learn online and you seem to know more people. But you have fewer real world friends than you could have in a conventional course.
A: Errh, I've never thought about that.
B: Um, the teacher in my online class spends a lot of time answering students' emails. Maybe that's a disadvantage for the teacher.
A: Oh , yes, it's a hard job for the teachers in an online course.