When the crab's abdomen is upward, you can see a triangle (male crab) or an ellipse (female crab), which is pried open from the tip and broken at the root joint. At this time, its shell can be lifted forward from the tail, and other internal organs can't be eaten, such as cheeks (thin strips on both sides of branches) and intestines and stomach (protruding from the mouth with a diamond-shaped stomach). Cover the crab shell back and steam it.