画空间形体直观图，是 学生学习立体几何的难点 之一。通过绘制直观图的教学，树立学生的空间观念，发展学生的空间想象能力，是学生学好立体几何的开端。 下面谈谈画好直观图的几种辅助方法。 １．断开法 在画直观图中，以线条的“断开”表示它们在空间的交错位置关系（即异面 An intuitive visual depiction of space is one of the difficulties for students to learn solid geometry. Through the teaching of drawing visual diagrams, establishing students’ spatial concepts and developing students’ spatial imagination ability are the beginning of students’ learning of solid geometry. Let’s talk about several auxiliary methods to draw a good picture. 1. The disconnection method In the pictorial diagram, the “disconnection” of the lines indicates their staggered positional relationship in space (ie