If it is only slightly stuck: You can find the gap on the edge of the floor drain board cover, use a hook to lock it, and rotate it with a little force. If it can be turned, you can directly lift and open the cover.
If it is stuck: use a screwdriver to align with the gap of the floor drain cover, and draw a circle around the cover, so that there is a relatively large gap between the cover and the floor drain. As long as there is looseness, it can be easily opened.
