小时上课,老师常手捏粉笔,在黑板上书写、绘图进行讲解。板书后的老师,大体分为两种风格。一种是写完后,盯着黑板讲课,讲完之后,自己动手,拿起板擦,把黑板擦干净,再继续书写粉笔字。四五十分钟的一节课,反复擦写数次。等到下课时,此等老师的仪容就比较惨,指端染白,袖子缘镀了银边,头发、肩膀上都留下薄薄的粉笔灰,“朝如青丝暮成雪”。 Hours of class, teachers often pinch chalk, writing on the blackboard, drawing to explain. After the blackboard teacher, generally divided into two styles. One is finished, staring at the blackboard lectures, finished, do it yourself, pick up the eraser, wipe the blackboard clean, and then continue to write chalk words. Four or five minutes of a class, repeated erase several times. Wait until after class, the teacher’s grooming is rather miserable, fingertips dyed white, the edge of the sleeve plated silver edge, hair, thin chalk on the shoulders are left ash, “As the dark twilight into snow ”.