Stringing steps:
1. Open the word document and click to open the patent picture that needs to be drawn with a horizontal line.
2. In the menu bar, click - Shape under the Insert menu and select the straight arrow shape.
3. Use the mouse to drag on the picture to get the shape of the indicator arrow, and adjust it to the appropriate position.
4. Click on the toolbar - text box, insert a simple text box, and you are done.