所谓防微杜渐，就是在坏思想或坏行为刚冒头或没冒头时就加以制止，不让其发展．也就是防患于已然或未然。当教师特别是当班主任，对学生的思想教育工作，一定要抓小、抓早、抓好。一个小小的火星，及早发觉了．用手指也不难将它捏熄；野火蔓延开后，虽最现代化的灭火高科技， The so-called anti-microbialism is to stop the development of bad thoughts or bad behaviors when they just start or fail to do so. That is, it is already possible or not. When teachers, especially those in charge of classes, are ideologically educated about students, they must grasp small, grasp early, and do a good job. A small Mars was discovered early. It is not difficult to pinch it out with fingers; after wildfire spreads, it is the most modern fire fighting technology.