Dotted lines and solid lines can usually be judged by the color and line type of the lines. Solid lines are generally black or other dark colors, and dashed lines are often gray or other light colors. Moreover, the solid line is composed of continuous real line segments, and the dotted line is composed of short line segments at intervals, forming an intermittent effect. By observing the color and line type of lines, we can accurately judge the difference between dotted lines and solid lines.