等高线画图工具。通过在多个图上划分等高线，来区分不同区域的划分，一般用在地理及力学上，比如气压分布、比压分布等。工程上有时也会需要标注不同区域的受力点等。-The contour drawing tools. Divided by multiple chart contour to distinguish between different areas of the division, is generally used in geography and mechanics, such as p