Turn on object snapping, select a snapping point, and snap the circle center or center point at the bottom of the ashtray when moving. Drag to the center point of the edge of the table, click, and then translate half a distance along the edge perpendicular to the edge you captured (or select the ashtray, move it, select the intersection point of the vertical edge when selecting the capture point, that is, the endpoint, and then select the midpoint on the vertical edge of the point. ) just in the middle, nothing like what you said will happen. Hope to adopt