有强烈责任感的的教师,总想把更多的东西教给学生。有强烈求知欲的学生,总想在教师那里学到更多的东西。但实际上学校各科的教学时间都是有规定,受限制的,要受时间的制约。知识无限,教、学的时间有限。要在有限的教、学时间内,教,学无限的知识,教师就要很好地做“文章”。或则把教学内容“合成”、“提炼”得成为含有“多种营养成分”、“多种维生素”的“高级营养 Teachers with a strong sense of responsibility always want to teach more things to their students. Students who have a strong curiosity always want to learn more from teachers. However, in fact, the teaching hours of all subjects in schools are regulated and restricted, subject to the constraints of time. Unlimited knowledge, teaching, learning time is limited. In a limited period of teaching and learning, teaching, learning unlimited knowledge, teachers should do a good job “articles.” Or the teaching content of “synthesis”, “refining” has become a “multi-nutrient”, “multivitamins” and "Advanced Nutrition