Regarding the abdominal marking line, the left lower and right rib areas are correct. The horizontal line on the abdominal boundary line: passing through the line between the lowest points of the ribs on both sides 10, the lower horizontal line: passing through the line between the iliac tubercles on both sides, and the left and right vertical lines: passing through the midpoint of the left and right inguinal ligaments, and intersecting the above two horizontal lines vertically.