1、 绘制出的教室里的基本物体：黑板、讲台、投影仪、空调、门窗、音响、九张桌子、九张凳子等。虚拟教室整体看上去接近真实生活中的教室。(Drawing out the basic objects in the classroom: blackboard, platform, projector, air-conditioning, doors and windows, audio, nine tables, nine stools and so on. The virtual classroom