实践证明,在教学过程中,教师和学生时间投入的多少,并不总是与教学效果成正比的。教得愉快,学得轻松,收效也明显;教的困难,学的费劲,则收效甚微。即使是同样的收获,教师与学生所付出的劳动也是不同的。很显然这和教师的教学水平、教学方法及学生的知识与智力差异有关,即教师如 Practice has proved that in the teaching process, teachers and students how much time invested, is not always proportional to the teaching effectiveness. Teach well, learn easily, the effect is obvious; teaching difficulties, learning hard, then with little effect. Even with the same gains, the work done by teachers and students is different. Obviously, this is related to the teaching level of teachers, teaching methods and students’ knowledge and intelligence differences, that is, teachers such as