1. After the crab is cooked, it usually takes about 15 minutes to steam. Small crabs need less time, generally only need about 10 minutes. When steaming crabs, be sure to put some salt and ginger to better remove the fishy smell.

2. River crabs, also known as "hairy crabs", are hard in texture and round in overall shape. It has a pair of eyes on the front and two crab teeth on the side. There are a pair of crab claws in front with a lot of fluff and four short feet in the back. The body is flat; The male's abdomen is triangular, while the female's is round.