画蛇而别添足就恰到好处,画龙而不点睛则前功尽弃。可见,多一笔则误,少一笔则败。这就是个分寸问題。恰如其分地掌握分寸,本是美学的一个重要原理,它适应一切艺术领域,包括课堂教学这门特殊艺术。 It is just right to draw a snake and don’t want to add extra weight to the painting. It can be seen that one more mistake is less and the other is less. This is a matter of proportion. Properly grasping proportions is an important principle of aesthetics. It adapts to all fields of art, including classroom teaching.