"...รบกวนสมาธิของชั้นเรียน..." is a definite Thai fixture: Thai class rooms must be orderly and quiet. This equates to teachers' psychology of "I am giving you children knowledge". And perhaps a reason why children fail to take the knowledge. Many children want to 'learn' by working with facts, imagination and experiments. Many children learn after they have, by themselves, failed again and again. Many learn from friends. (Talking when they are learning -- at the moment the issue is still fresh in their mind, not after class -- helps to learn quickly. How do we talk and work things out? How politicians take turn to talk and never get things done?) ;-)