How to export ppt into high-definition pictures

It will still be available before the New Year, but after the New Year, the exported pictures are very ugly.

I remembered, and finally remembered.

Idea : Right-click on the picture on the PPT -> save as picture, the resolution is as high as 2020*1145

Note : If you use File->Export as a picture, you need to lose the resolution, and it is not clear how to comb.