The human torso is supported by the spine. When people reach old age, the functions of various organs in the body deteriorate, and osteoporosis also occurs quietly. Vertebra is mainly composed of cancellous bone. Osteoporosis is most likely to occur in cancellous bone. The trabecular bone in cancellous bone becomes thinner, decreases, disappears or even forms cavities, and the strength and compression resistance of bone are greatly reduced, and the bearing function of spine is reduced. At this time, some small fractures often occur inadvertently. For example, when the elderly are doing some movements such as twisting their bodies and bending down to take things, they suddenly feel low back pain, and a compression fracture of the spine may occur. In addition, the intervertebral disc connecting the vertebral body can degenerate and dehydrate due to aging, and the gap between vertebrae becomes narrower, which makes the height shorter. Due to the thinning of intervertebral disc, the compression resistance is weakened, and the vertebral body is prone to fracture when subjected to even a slight external force, which further shortens the vertebral body. If repeated fractures occur in multiple vertebral bodies, the height of a person can be shortened by about 10cm. Why did you shout "report" when you were late? When I first joined the education team, there was always a problem that I couldn't figure out. When students are late, they always shout a report at the door or outside, and they can only enter the classroom with the permission of the teacher. For the sake of several teachers, why do students shout to report when they are late? They told me, "This is the most basic requirement in class; It is the minimum respect for teachers; Students dare not be late at will because they have to shout a report. " Students can't come into the classroom when they are late without the teacher's permission. On the one hand, it can reflect the moral dignity of teachers; On the other hand, it can reduce students' being late at will. It's good to think about it, so in the next class, if a student is late, be sure to shout a report and explain the reason for being late before letting the students into the classroom. However, over time, I always feel that something is wrong. There are good reasons for being late. After a period of understanding, the main reasons why students are late are as follows. In the last class, the teacher dragged his feet, and the class was over after the second class. The toilet is too crowded and there is a queue. 10 minute class time is too short; Please go to the office for individual counseling or education; If you are hungry, buy something to eat ... I think every reason given by students when they are late is reasonable. It is not the responsibility of the students for the teacher to delay class. The toilet is crowded, so many students often have to queue up to go to the toilet at that time; The teacher asked them to go to the office, and there was no reason to refuse; When you are hungry, fill your stomach first. It is always bad to go to class on an empty stomach, and the effect is definitely not good. That makes sense. It is meaningless to ask students to explain why they are late. For such a good reason, I simply can't bear to criticize a few more words. Please come in quickly. Shouting and reporting affect the normal order. A few minutes before each class, try to create various situations, so that students' attention can be focused on the class in the shortest time. Because of careful preparation, I feel that the first few minutes of each class are wonderful. However, what I said in it was full of enthusiasm, I found the feeling of class, and the students focused on the class. At this time, a "report" suddenly happened outside the door, so I had to stop and invite my classmates in. The students' thinking was also interrupted, and all the attention was focused on the students who were late. Sometimes, when they meet a timid person, any action will cause a burst of laughter. Because the class was interrupted by a "report", we had to reorganize the teaching, and sometimes we couldn't find the passion for class, and students couldn't find the feeling of listening and thinking. The Report has affected the normal teaching order and caused damage to other students. Calling "report" late is actually a great disrespect to teachers and other students, infringing on the interests of other students and wasting their study time. Shouting "report" is disrespectful to students who are late. Many times students are forced to be late, and subjectively don't want to be late. It is the right of students to attend classes in the classroom and cannot be deprived. It is also the right of students to be late for class. We can't refuse students to enter the classroom on the pretext of being late. Students who are late are already very anxious. If they have to shout "report" at the door, all the students' attention will be focused on this student. Timid students may not learn from this. So in the later teaching, I changed my practice. Every time I have a class in a new class, the first class will say, "It's your right to be late, so just come in late, don't make any noise, walk as quietly as possible, and don't shout for a report." After I have said this, students will come into the classroom quietly as long as they are late, which will not have any impact on my classroom. At the same time, it did not appear, because I said so, which increased the number of students who were late. It is common for everyone to shout "report" late, but they usually turn a blind eye, like a pile of ancient historical garbage. But I carefully reflect on this practice and find out the truth before I find out my own practice, which is sometimes ridiculous. In the face of common things, ask yourself "Why?"