吃自助餐和教师教学有许多相通的地方。每一样都想品尝一点与选择素材的面面俱到。吃自助餐的人每一样都想尝一尝,落下哪一样都觉得可惜,后果是既浪费,又吃得不过瘾。同样,教师在备课过程中,为了更好地充实课程素材,查阅大量资料,觉得这个不错,那个也应该让学生知道,结果讲课时发现时间总是不够,还有好多没有讲。当检验学生收获时,才会发现,似乎这儿也没讲透,那儿也没有讲清……典型的吃力不讨好。因 There are many places to eat buffet and teacher teaching. Everyone wants to taste a little more than everything you choose. Everyone who wants to have a buffet wants to taste it. What a pity to fall down. The consequences are both wasteful and unpleasant to eat. Similarly, teachers in the lesson preparation process, in order to better enrich course materials, access to a large amount of information, think this is good, that should also let students know, the results of lectures found that time is not enough, there is a lot of did not say. When you test the students harvest, only to find that it did not seem to penetrate here, there did not tell ... ... typical thankless. because