The toolbar Drawing in word opens, and by default it appears in the horizontal bar at the bottom of the window. You can use the Line tool to draw a line in a picture and draw a downward arrow by adding an arrow to the line. Other numbers can be changed into colorless border lines by using text boxes (which can also be found in the drawing toolbar, and arrows can also be input as characters through some input methods). Finally, use the "Select" tool to select all of them and "combine" them into a whole.