How does ps stretch the picture without local deformation?

When we use ps, we can stretch the picture at will, but sometimes stretching will deform, so how can we not deform?

1. Open the picture to be stretched in ps.

2. press Ctrl+J to copy the background layer.

3. Select "Lasso Tool" in the toolbar on the left, and select the area you don't want to deform.

4. Select the "Select-Save Selection" option in the menu bar.

5. Enter a name in the saved selection dialog box that pops up, and click OK.

6. press Ctrl+D to cancel the selection.

7. Select the "Edit-Content Recognition Scale" option in the menu bar.

8. Select the "Giraffe" option just stored in "Protection" at the bottom of the menu bar.

9. Resize the picture to a suitable size, and then click the "Apply" button.

10. After the picture is stretched, the selected area will not be deformed.

This paper is based on Dell Yue Ling 5000 brand, Windows 10 system and Photoshopcc20 18 version.