Make ppt timeline

Enable guides , And set the background to a solid color （ Choose the color you want ）

Copy four slides , With different background colors

Insert circle , Hold down shift Key and insert the circle

Set the outline of the circle to white , Thickness changed to 3 pounds （ Press the left key on the shape ）

Set fill to no fill

Draw a circle in the center of the circle （ Select Insert circle and press ctrl+shift key ）

Cancel the outline and fill with white

Copy the circle

Insert a straight line , Set to white , And set the thickness to 3 pounds , And change to dotted line

Copy line , Get the horizontal line by rotating , Then copy the big circle , We get the following graph

Place year and title

Add animation effect

• Add an erase effect from the top to the first line
  

• Set the scaling effect for concentric circles , Set delay 0.25
  

• Set the erase effect for the left connector （ From left ）, Set delay ： After the last animation 0.25
  

• Set the zoom effect for the right circle
  

• Set the zoom effect for the text
  

• Set down in sequence

• Copy all the contents of the first slide to the second slide and modify

• Change the switching mode of all slides to push