高低低高巧妙运用——突破等值线教学难点例谈□杨斌许良森（江苏省宜兴中学在中学地理中，有关等值线（包括等温线、等压线、等压面、等高线）的分布规律方面的知识既是教学重点，也是教学难点。笔者在长期的教学实践中，发现其分布规律有一个共同的特征，那就是“高低低... Ingenious application of high, low, and low heights - Breakthroughs in the teaching of isoline teaching YANG Bin XU Liangsen (In Yixing Middle School in Jiangsu Province, the equivalent line (including isotherms, isobaric lines, isobaric surfaces, contour lines) The knowledge of distribution law is not only the teaching focus but also the teaching difficulty.The author found that in the long-term teaching practice, its distribution law has a common feature, that is, “high and low...